Archive of Bulletin Messages
Jun 2001 - Jan 2002

Compiled Messages:

------------------------------------------------------------
Message no. 1 posted by Dr. Jerrel Yates (math1227a) on Mon Jan 15, 2001 11:32
Subject Welcome
Welcome to Math 1127 Lecture class and Math 1127 Online
class. Feel free to post your questions here.

Dr. Yates
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Message no. 2 posted by Dr. Jerrel Yates (math1227a) on Mon Jan 15, 2001 11:36
Subject Withdrawing from an Internet Class
Step 1

Student sends an e-mail to the instructor indicating
his or her intention to withdraw. The e-mail must
include the following:

Student Name Student SSN or ID Number Term Enrolled
Course Name and Number Course Reference Number (CRN)

Step 2

The instructor should then forward the student's e-mail
to the Registrar's Office at the following address:

registrar@colstate.edu

Step 3

Staff in the Registrar's Office will process the
withdrawal using the date the student sent the e-mail to
the instructor.

Dr. Yates

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Message no. 3 posted by Ryan Taylor (taylor_ryan) on Mon Jan 15, 2001 21:36
Subject multiple log ons
Dr. Yates

Is there a way to log off of WebCT? There are two of us
trying to use the same computer but everytime the second
person tries to log on with their separate WebCT ID and
password, it takes her directly to my log on page. How
can two users use the same computer? If the system will
not allow you to log off and another user to log on
separately, how are we to use campus computers? Will
our information remain onscreen for anyone to see?

Ryan Taylor
------------------------------------------------------------
Message no. 5 posted by Ryan Taylor (taylor_ryan) on Thu Jan 18, 2001 16:13
Subject Taking quizzes
Dr. Yates

I need some help with these quizzes. In the Lesson 3
Quiz it asks a question involving a "length of stay data
set WEN-3 (homework, lesson 3 ActivStats)" but I don't
have any idea where to find it. Also, in the Lesson 4
Quiz it asks you to manipulate a data set from "Problem
4.12 Cavendish data available in data desk as MRA-4" but
again, where is this? What is Problem 4.12 and where is
this data set? I have looked all through data desk and
cannot find either of these things. Help! I am
progressing fine with the material but it is just
frustrating when I want to take the quiz for the lesson
but I cannot locate the data.

Ryan Taylor
------------------------------------------------------------
Message no. 7 posted by Dr. Jerrel Yates (math1227a) on Thu Jan 18, 2001 23:48
Subject Wen-3 Data

41 16 6 21 1 21 5 31 20 27 17 10 3 32 2 48 8 12 21 44 1
56 5 12 3 13 15 10 18 3 1 11 14 12 64 10

------------------------------------------------------------
Message no. 8 posted by Dr. Jerrel Yates (math1227a) on Thu Jan 18, 2001 23:51
Subject Earth Data MRA-4
5.50 5.61 4.88 5.07 5.26 5.55 5.36 5.29 5.58 5.65 5.57
5.53 5.62 5.29 5.44 5.34 5.79 5.10 5.27 5.39 5.42 5.47
5.63 5.34 5.46 5.30 5.75 5.68 5.85

------------------------------------------------------------
Message no. 9 posted by Dr. Jerrel Yates (math1227a) on Fri Jan 26, 2001 13:41
Subject Lecture Class Arnold 105 Jan 29 & 31
</pre>Will be working all types problems
from the normal distribution. * z-scores 
* Areas under normal curve * Given an area
under the normal curve, find the corresponding data
value 

Dr. Yates

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Message no. 12 posted by Dr. Jerrel Yates (math1227a) on Wed Jan 31, 2001 12:32
Subject Lecture Class Test 1
Test 1 for lecture class will be 1-2:15 PM,Monday, Feb
5th, Arnold 204. Test 1 covers chapter 1 of BPS (same
material as lesson quizzes 2-5).

Dr. Yates
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Message no. 13 posted by Dr. Jerrel Yates (math1227a) on Wed Jan 31, 2001 12:42
Subject Reminder: Test 1 Online Statistics Class
Test 1 for online statistics class will be Saturday,
Feb. 3rd, 11am-1pm, Arnold 204. Should be a few extra
computers for students in my lecture class should they
wish to take it with the online students. The online
students have priority.

Dr. Yates
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Message no. 15 posted by Dr. Jerrel Yates (math1227a) on Mon Feb 05, 2001 08:37
Subject Lecture Class Test 1 Delayed
Test 1 for Math 1127 (CRN 20723, MW 1 PM Arn 105) will
be delayed until Wednesday, February, 7th. The test
will be in Arnold 204 1-2:15.

I am under the weather today. Sorry for any
inconvenience.

Dr. Yates
------------------------------------------------------------
Message no. 16 posted by Folayan Brown (brown_folayan) on Mon Feb 12, 2001 09:54
Subject GRADE CHART
Dr. Yates, I was trying to see my grades, but the
chart was squinched together to where I could not
maximize it or anything. Is there something wrong or am
I in the wrong area to see the grades? Please help!
Thanks!

Folayan
------------------------------------------------------------
Message no. 19 posted by Dr. Jerrel Yates (math1227a) on Thu Feb 15, 2001 22:52
Subject WF Course Grade Math 1127 20723 & 20727
If you have not taken test 1 or have not scheduled a
time to take test 1, then you are in danger of receiving
a WF for this course. Please contact me via email
within the next week, if this applies to you.

Dr. Yates
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Message no. 20 posted by Dr. Jerrel Yates (math1227a) on Fri Feb 16, 2001 11:10
Subject Feb 17th Online Testing
Reminder. Test 2 will be Saturday, Feb 17th Arnold 204,
11am - 1pm (arrive by noon).

You may also makeup test 1 or take test 3 at this time.

Dr. Yates
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Message no. 22 posted by Dr. Jerrel Yates (math1227a) on Fri Mar 02, 2001 13:14
Subject Emails
If you sent me an email between 7 PM Feb 28 and 9 AM
March 1st, I may have missed it.

Dr. Yates
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Message no. 23 posted by Folayan Brown (brown_folayan) on Thu Mar 08, 2001 12:31
Subject LAB
Which lab is the one that you want us to do. Is it the
minitab or lab 1 graphics and descriptive data?

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Message no. 25 posted by Dr. Jerrel Yates (math1227a) on Sun Apr 01, 2001 14:02
Subject Test 4 Lecture Class
Test 4 Lecture class (crn 20723) is Wednesday, April 4,
1-2:15 PM (arrive by 1:15 PM), Arn 204. There will be
space available for Online line students to take their
next test at this time also, just email me to confirm.

Next test date for Online students (crn 20727) is
Saturday, April 21st, 11-1pm, Arn 204. There will be
space available for Lecture Class students to take their
next test at this time also, just email me first to
confirm. Time is running out and we must finish all
lesson quizzes, tests and final exam by May 5th.

Dr. Yates

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Message no. 26 posted by Dr. Jerrel Yates (math1227a) on Wed Apr 11, 2001 12:13
Subject Online Normal Table Problem
There is a major problem with my online normal table for
z values greater than 0. Will try to fix before the day
is over (4/11/2001).

Dr. Yates
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Message no. 28 posted by Dr. Jerrel Yates (math1227a) on Sun Apr 15, 2001 17:43
Subject Test 5 Online Class
</pre>Reminder.

Tests 1-5 for the online class is Saturday, April 21st,
Arn 204, 11-1. Lecture class students can elect to take
test 5 at this time also.

All students must complete Tests 1-5 and the Final
Exam by Saturday, May 5th. Dr. Yates

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Message no. 29 posted by Dr. Jerrel Yates (math1227a) on Wed May 02, 2001 09:23
Subject Final Exam Spring 2001
If you are registered for my online class or my lecture
class, you may take the final exam at either of the
times listed below:

Math 1127 Lecture CRN 20723 -- Arnold 204, Fri., May 4
at 12:00-2:00 PM

Math 1127 Online CRN 20727 -- Arnold 204, Sat., May 5
at 11:00 - 2:00 PM (arrive by Noon).

But you must take the final exam and any remaining tests
at one of the times above.

Dr. Yates

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Message no. 30 posted by Roach Dorothy (roach_dorothy) on Mon May 21, 2001 06:04
Subject first test and meeting place
I just wanted to make sure of when our first test was, I
know I have it here on a paper, but it escapes me for
the moment. Thanks, Dorotby Roach
------------------------------------------------------------
Message no. 32 posted by Dr. Jerrel Yates (MATH1127_50332) on Tue May 29, 2001 22:59
Subject Test Day Again => May 30th
Wed May 30th is test day. 6-7 PM Arnold 204. You need
to take test 1 no later than June 13th. Starting June
6th test time is 5-7 PM. You can take more than one
test on a given day if you have time. Pay close
attention to which lessons need to be completed for a
given test and be sure you have taken the lesson quizzes
for those lessons.

If you have questions, you may come by and ask questions
6-7 in Arn 204 tomorrow also.

Dr. Yates
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Message no. 33 posted by Dr. Jerrel Yates (MATH1127_50332) on Wed Jun 06, 2001 21:50
Subject Out of Town

I will be out of town Thur-Sun, June 7-10 and away from
an internet connection. Please post any questions on
the WebCT bulletin board. Someone in class can
probably answer it.

Will try to catch up on any emails and WebCT bulletin
messages Sunday night.

Dr. Yates
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Message no. 34 posted by Dr. Jerrel Yates (MATH1127_50332) on Fri Jun 15, 2001 13:16
Subject Test 1
</pre> Hi,

My records show that some of you have not yet taken
test 1. You need to take test 1 by Wednesday, June
20th. The testing time is 5-7 PM, each Wednesday until
July 25th (except July 4th), Arnold 204. Please
complete lesson quizzes 2-5 before test 1 to ensure
that you are prepared. 

If there is problem with the testing time, I should have
been notified earlier. So notify me quickly if there is
a problem with the time. 

Some of you have not given me you home email address.
Until you do, your colstate email address is my official
means of contacting you. 

See you Wednesday. 

Dr. Yates 

-- Jerrel Yates Mathematics Department Columbus
State University Columbus GA 31907 

email:jkyates@mindspring.com web:
http://math.colstate.edu/jyates Math 1127 Online:
http://math.colstate.edu/jyates/Math1127Online/ 
MathDeptWeb:http://math.colstate.edu/ 
------------------------------------------------------------
Message no. 35 posted by Dr. Jerrel Yates (MATH1127_50332) on Fri Jun 15, 2001 13:18
Subject Testing Time
Testing is now 5-7 PM each Wednesday in Arnold 204. (No
testing on July 4th.) If this time is impossible for
you, please contact me.

Dr. Yates
------------------------------------------------------------
Message no. 36 posted by Dr. Jerrel Yates (MATH1127_50332) on Tue Jun 26, 2001 12:03
Subject Probability Question
Student question:I am having some difficulty with the
probability problems. I am not sure why there is a 1/6
chance to roll dice once and have a sum of seven. I
thought it would be 1/36, (1/6)(1/6) for each die.

Answer:
http://math.colstate.edu/jyates/Math1127Online/lectures/lesson12-13/questions/lesson12-13questions.htm
------------------------------------------------------------
Message no. 37 posted by Dr. Jerrel Yates (MATH1127_50332) on Tue Jun 26, 2001 23:43
Subject Probability Question
I can not understand how to arrive at the answer in the
back of the book. The question states "Jim bets on red
on each of two spins of the wheel. What is the
probability that he will winn on the first spin and lose
on the second spin. (The roulette wheel is "fair" and
has 38 compartments- 36 plus 0 and 00. Of the 38
compartments, 0 and 00 are green, 18 of the others are
red, and 18 are black. A simple wager is red or black,
in which you bet that the ball will stop in, say, a red
compartment. If the wheel is fair, all compartments are
equally likely?? We have already established that the
probability of a red is 18/38 = .4737. So why wouldn't
this also be the first part of the answer for question
c??? The answer given in the back is .4327 for the
likelihood of winning on the first try multiplied by
.5673 (which I understand is the difference between "1 -
.4327, and these two numbers are multiplied according to
the multiplication rule for probabilities. Help me
understand this please.

Answer.
http://math.colstate.edu/jyates/Math1127Online/lectures/lesson12-13/questions/lesson12-13questions.htm
------------------------------------------------------------
Message no. 38 posted by Dr. Jerrel Yates (MATH1127_50332) on Thu Jun 28, 2001 14:14
Subject Substitute Testing Time
To Math 1127 Online:

Due to the Fourth of July holiday, for one time only,
testing will be in ARN 204 from 5-7 PM, Monday, July 2.
The following week testing will resume on Wednesday's
5-7 PM, Arnold 204. See
http://math.colstate.edu/jyates/Math1127Online/testingschedule.htm

Dr. Yates
------------------------------------------------------------
Message no. 39 posted by Dr. Jerrel Yates (MATH1127_50332) on Sun Jul 08, 2001 14:55
Subject Time is running out
Less than three weeks left. Some of you are almost
finished. Others need to go into double time and triple
time to finish by July 25th. Questions via email or
WebCT Bulletin are welcome. Good luck.

Dr. Yates
------------------------------------------------------------
Message no. 40 posted by Dr. Jerrel Yates (MATH1127_50332) on Tue Jul 17, 2001 23:43
Subject Lesson 19/20 Questions
</pre>Answers to questions below (and the
questions below) are on my website at:
http://math.colstate.edu/jyates/Math1127Online/lectures/lesson20/questions/lesson20questions.htm

Labeled questions 5, 6 and 7. 

Dr. Yates

 Questions.1. How do you calculate the
following? A very large high school wishes
to know how it compares to the national average
on the SAT Math. The national average is
u=600, the population standard deviation is 82. They
believe that their students average is different
from the national average. A SRS of 26
students is chosen and their average on the SAT
Math is found to be 562. The null and
alternative hypotheses are: H0:u=600 and Ha:u
does not = 600.

The formula is z=x-u0/st dev/sqrt of n which is
562-600/82/sqrt of 26, which is -2.36. I was
under the impression that I should then find
the z-score of the 2.36, which is .9909, and
then multiply .9909 by 2, which gives me
1.9818. I understand that the answer should be
between 0 and 1, so this is obviously wrong.
Could you please explain what I have done wrong?

2.How do you find the z* for the critical
region when the a=.02? I am able to do the
problems when the a=.05, due to the chart in
the lecture notes, as it includes .05, but I do
not understand how to calculate the problems
that don't have the "a" on the chart in the
notes.

3.When Ha:u does not equal the mean , how do
you calculate t*? For example, in the
question, " A very large school system wishes
to know how it compares to the national average
on the SAT Math. The national average is
u=600. The standard deviation is s=110. They
believe that their students average is different
from the national average. A SRS of 15 students is
chosen and their average on the SAT Math is found
to be 570. The null and alternative hypothesis
are: H0:u=600 and Ha:u does not = 600. If the
level of significance is .05, what is the
critical value t* for the critical region."
Since the correct answer is 2.145, does that
mean that to find df in this situation you use 2n? This
doesn't seem logical, but it does supply a very
close answer (2.147).
------------------------------------------------------------
Message no. 41 posted by Dr. Jerrel Yates (MATH1127_50332) on Sun Jul 22, 2001 14:28
Subject Lesson 20 Question
Question(s). I have a question about Exercise 20.3,
page 257. When I calculate "t" I get .697, but the
answer in the back of the book says 6.97. Next, I am not
sure how they came up with "p". Am I supposed to be sing
a computer program for these problems (lesson 20) or
will I be able to use tables in the book? Similarly, in
Example 20.1, page 251, they determine a P-value with a
computer program. Is this the only option, can you not
use tables?

Ans. See Question 8 & Answer at:
http://math.colstate.edu/jyates/Math1127Online/lectures/lesson20/questions/lesson20questions.htm

Dr. Yates

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Message no. 42 posted by Dr. Jerrel Yates (MATH1127_50332) on Sat Aug 25, 2001 11:08
Subject Testing Fall 2001
</pre>Testing Schedule Tests will be given
each Tuesday, 6 -7 PM (must arrive by 6:15), Arnold 204,
starting August 28th. You should take the test as soon
as you finish the corresponding lessons and lesson
quizzes. Those wishing to complete this course early
may do so by taking more than one test each two &
one-half weeks. You must average at least one test
every two & one-half weeks to stay on schedule. You may
arrange to take the Final Exam as soon as all the tests
have been taken. You must complete the final by
Tuesday, December 11th. Additional testing times
(Arnold 204). 12-3 PM MWF & 1-3 PM TTh. You must
arrive at least one hour before the end of the period,
i.e., you must arrive by 2 PM. Ms. Melinda Pell is the
proctor for these additional testing times. Ms. Pell's
schedule may change during the semester. So, please
email Ms. Pell 24 hours before you plan to take a test
(Pell_Melinda@colstate.edu). Final Exam:
Arnold 204, Tuesday, December 11th, 4:30 -7:15. Must
arrive by 6:15 PM.Dr. Yates

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Message no. 43 posted by Dr. Jerrel Yates (MATH1127_50332) on Fri Aug 31, 2001 22:22
Subject Grouped Average Question
Question. On the quiz for lesson 4 I have a
question about the question about "Compute the mean of
the group." I plugged the correct information in my
calculator and it came up wrong. The averages were 72
and 82. The class sizes were 25 and 19. I came up
with 77, by hand and on the calculator, but the
computer  said the answer was 76.3. How did it get
that answer?

<a
href="http://math.colstate.edu/jyates/Math1127Online/lectures/StatisticsLectures.htm">Answer</a>
 Dr. Yates

------------------------------------------------------------
Message no. 44 posted by Terri Long (long_terri) on Sun Sep 09, 2001 10:08
Subject 1127 Labs
Can anyone tell me where to find the lab assignments? I
must not be going to the correct screen to access them.

------------------------------------------------------------
Message no. 45 [Branch from no. 44]
posted by Dr. Jerrel Yates (MATH1127_50332) on Sun Sep 09, 2001 18:27
Subject Re: 1127 Labs
Math 1127 Lecture. Labs are at
http://math.colstate.edu/jyates/1127/Labs/Labs.htm

Dr. Yates
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Message no. 46 posted by Dr. Jerrel Yates (MATH1127_50332) on Tue Sep 11, 2001 13:01
Subject Online Testing Tuesday, September 11th
Online testing will be given tonight as scheduled 6-7 PM
Arnold 204.

Dr. Yates
------------------------------------------------------------
Message no. 47 posted by Kristopher Starling (starling_kristopher) on Wed Sep 12, 2001 19:40
Subject Partial Credit?????
Dr. Yates, I turned in a paper full of numbers on it to
Mrs. Pell, was that all for null or was that the right
thing to do? I heard that you do give partial credit.
When might that show up on our grades. Thanks Lee
Starling
------------------------------------------------------------
Message no. 49 posted by Dr. Jerrel Yates (MATH1127_50332) on Thu Nov 01, 2001 22:54
Subject Out of Town
I will be out of town November 2-3 2001.

Dr. Yates

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Message no. 50 posted by Dr. Jerrel Yates (MATH1127_50332) on Thu Nov 01, 2001 22:56
Subject Math 1127 Online
You should have completed test 3 by now to be on
schedule. If not you need to speed up.

Dr. Yates
------------------------------------------------------------
Message no. 51 posted by Dr. Jerrel Yates (MATH1127_50332) on Tue Nov 13, 2001 17:54
Subject Staying on Track
You need to complete test 4 by the Thanksgiving break to
stay on track. Dr. Yates
------------------------------------------------------------
Message no. 52 posted by Dr. Jerrel Yates (MATH1127_50332) on Sun Nov 18, 2001 16:50
Subject Testing Nov 22
Testing will be 6 PM - 7 PM as usual in Arnold 204. Try
to get another test in before Thanksgiving.

Dr. Yates
------------------------------------------------------------
Message no. 53 posted by Dr. Jerrel Yates (MATH1127_50332) on Mon Dec 03, 2001 22:58
Subject Math 1127 Online
The final exam is Tuesday, December 11, 4:30-7:15
(arrive by 6 PM). You may also take the final Friday,
December 14th, 2:15-4:15 (arrive by 2:45). Ms. Pell
may be available at times next week but please contact
her at least 24 hours in advance. She will be in
Tucker Hall next week and her hours are uncertain.

Those of you who are ready to take the final but have
not taken all five tests may take the 90%% final. It
will count up to 90%% of your grade and is completely
comprehensive. You will need at least two hours to
complete this test.

Lecture class students may take their final Tuesday,
December 11 with the online students.

Dr. Yates

------------------------------------------------------------
Message no. 54 posted by Dr. Jerrel Yates (MATH1127_50332) on Mon Dec 03, 2001 23:02
Subject Lecture Class
Lecture class students may take their final Tuesday,
December 11 with the online students. The final exam for
the online class is Tuesday, December 11, 4:30-7:15
(arrive by 6 PM).

The scheduled time for the lecture class final is 2:15
PM to 4:15 PM, Friday, Dec 14th.

Lab 4 is due Monday, December 10th.

Dr. Yates

------------------------------------------------------------

Archive of Bulletin Messages
Jan 2001 - June 2001

Compiled Messages:

------------------------------------------------------------
Message no. 1: posted by Dr. Jerrel Yates (math1227a) on Mon Jan 15, 2001 11:32
Subject: Welcome
Welcome to Math 1127 Lecture class and Math 1127 Online
class. Feel free to post your questions here.

Dr. Yates
------------------------------------------------------------
Message no. 2: posted by Dr. Jerrel Yates (math1227a) on Mon Jan 15, 2001 11:36
Subject: Withdrawing from an Internet Class
Step 1

Student sends an e-mail to the instructor indicating
his or her intention to withdraw. The e-mail must
include the following:

Student Name Student SSN or ID Number Term Enrolled
Course Name and Number Course Reference Number (CRN)

Step 2

The instructor should then forward the student's e-mail
to the Registrar's Office at the following address:

registrar@colstate.edu

Step 3

Staff in the Registrar's Office will process the
withdrawal using the date the student sent the e-mail to
the instructor.

Dr. Yates

------------------------------------------------------------
Message no. 3: posted by Ryan Taylor (taylor_ryan) on Mon Jan 15, 2001 21:36
Subject: multiple log ons
Dr. Yates

Is there a way to log off of WebCT? There are two of us
trying to use the same computer but everytime the second
person tries to log on with their separate WebCT ID and
password, it takes her directly to my log on page. How
can two users use the same computer? If the system will
not allow you to log off and another user to log on
separately, how are we to use campus computers? Will
our information remain onscreen for anyone to see?

Ryan Taylor
------------------------------------------------------------
Message no. 4: [Branch from no. 3]
posted by Leann Thomason (thomason_leann) on Mon Jan 15, 2001 21:44
Subject: re: multiple log ons
Dr. Yates,

Ryan and I discovered the way for multiple users to use
the same computer. You have to shut the browser
completely down before it will allow you to log on with
a separate ID. We just wanted everyone to know in case
they were trying to do the same thing.

LeAnn Thomason
------------------------------------------------------------
Message no. 5: posted by Ryan Taylor (taylor_ryan) on Thu Jan 18, 2001 16:13
Subject: Taking quizzes
Dr. Yates

I need some help with these quizzes. In the Lesson 3
Quiz it asks a question involving a "length of stay data
set WEN-3 (homework, lesson 3 ActivStats)" but I don't
have any idea where to find it. Also, in the Lesson 4
Quiz it asks you to manipulate a data set from "Problem
4.12 Cavendish data available in data desk as MRA-4" but
again, where is this? What is Problem 4.12 and where is
this data set? I have looked all through data desk and
cannot find either of these things. Help! I am
progressing fine with the material but it is just
frustrating when I want to take the quiz for the lesson
but I cannot locate the data.

Ryan Taylor
------------------------------------------------------------
Message no. 6: [Branch from no. 5]
posted by Dr. Jerrel Yates (math1227a) on Thu Jan 18, 2001 21:59
Subject: re: Taking quizzes
Mr. Taylor,

From Lesson 3 of the ActivStat CD, click on the homework
icon. This will carry you to list of data sets for
lesson 3. Scroll down to the WEN data set.

Likewise for the earth data except click on the homework
icon while in lesson 4.

Dr. Yates
------------------------------------------------------------
Message no. 7: posted by Dr. Jerrel Yates (math1227a) on Thu Jan 18, 2001 23:48
Subject: Wen-3 Data

41 16 6 21 1 21 5 31 20 27 17 10 3 32 2 48 8 12 21 44 1
56 5 12 3 13 15 10 18 3 1 11 14 12 64 10

------------------------------------------------------------
Message no. 8: posted by Dr. Jerrel Yates (math1227a) on Thu Jan 18, 2001 23:51
Subject: Earth Data MRA-4
5.50 5.61 4.88 5.07 5.26 5.55 5.36 5.29 5.58 5.65 5.57
5.53 5.62 5.29 5.44 5.34 5.79 5.10 5.27 5.39 5.42 5.47
5.63 5.34 5.46 5.30 5.75 5.68 5.85

------------------------------------------------------------
Message no. 9: posted by Dr. Jerrel Yates (math1227a) on Fri Jan 26, 2001 13:41
Subject: Lecture Class Arnold 105 Jan 29 & 31
</pre>Will be working all types problems
from the normal distribution. * z-scores 
* Areas under normal curve * Given an area
under the normal curve, find the corresponding data
value 

Dr. Yates

------------------------------------------------------------
Message no. 10: [Branch from no. 9]
posted by Feroza Yassen (yassen_feroza) on Mon Jan 29, 2001 20:19
Subject: re: Lecture Class Arnold 105 Jan 29 & 31
Dr. yates, what time are we meeting on thosse dates?
------------------------------------------------------------
Message no. 11: [Branch from no. 10]
posted by Dr. Jerrel Yates (math1227a) on Mon Jan 29, 2001 22:06
Subject: re: Lecture Class Arnold 105 Jan 29 & 31
My lecture class meets from 1 PM to 2:15. Dr. Yates
------------------------------------------------------------
Message no. 12: posted by Dr. Jerrel Yates (math1227a) on Wed Jan 31, 2001 12:32
Subject: Lecture Class Test 1
Test 1 for lecture class will be 1-2:15 PM,Monday, Feb
5th, Arnold 204. Test 1 covers chapter 1 of BPS (same
material as lesson quizzes 2-5).

Dr. Yates
------------------------------------------------------------
Message no. 13: posted by Dr. Jerrel Yates (math1227a) on Wed Jan 31, 2001 12:42
Subject: Reminder: Test 1 Online Statistics Class
Test 1 for online statistics class will be Saturday,
Feb. 3rd, 11am-1pm, Arnold 204. Should be a few extra
computers for students in my lecture class should they
wish to take it with the online students. The online
students have priority.

Dr. Yates
------------------------------------------------------------
Message no. 14: [Branch from no. 13]
posted by Catrina Hill (hill_catrina) on Fri Feb 02, 2001 11:00
Subject: re: Reminder: Test 1 Online Statistics Class
Dr. Yates,

Due to my work schedule every weekend, I will not be
able to test on Saturdays. I am in the online class. I
would like to schedule my test for Tuesday, February 6,
2001. Please email me at my csu email address: Hill,
Catrina, or at my personal email address:
Aubnurse@aol.com, and let me know a time on Tuesday that
would be convenient for you.

Thank you so much, Tina Hill
------------------------------------------------------------
Message no. 15: posted by Dr. Jerrel Yates (math1227a) on Mon Feb 05, 2001 08:37
Subject: Lecture Class Test 1 Delayed
Test 1 for Math 1127 (CRN 20723, MW 1 PM Arn 105) will
be delayed until Wednesday, February, 7th. The test
will be in Arnold 204 1-2:15.

I am under the weather today. Sorry for any
inconvenience.

Dr. Yates
------------------------------------------------------------
Message no. 16: posted by Folayan Brown (brown_folayan) on Mon Feb 12, 2001 09:54
Subject: GRADE CHART
Dr. Yates, I was trying to see my grades, but the
chart was squinched together to where I could not
maximize it or anything. Is there something wrong or am
I in the wrong area to see the grades? Please help!
Thanks!

Folayan
------------------------------------------------------------
Message no. 17: [Branch from no. 16]
posted by Dr. Jerrel Yates (math1227a) on Mon Feb 12, 2001 10:50
Subject: re: GRADE CHART
Ms. Brown,

I will take a look at it and get back to you.

Dr. Yates
------------------------------------------------------------
Message no. 18: [Branch from no. 16]
posted by Dr. Jerrel Yates (math1227a) on Mon Feb 12, 2001 10:57
Subject: re: GRADE CHART
Ms. Brown,

I logged in under your id, entered Math 1127, and
clicked on check grades. Your grades showed up after
using the scroll bar on the right side. You are right
that it will not let you maximize which would be better
than using the scroll bar.

See if the scroll bar works and let me know if it
doesn't.

Dr. Yates
------------------------------------------------------------
Message no. 21: [Branch from no. 18]
posted by Folayan Brown (brown_folayan) on Mon Feb 19, 2001 09:38
Subject: re: GRADE CHART
Yes sir, The scroll bar does work. I could see my
grades. Thank you!
------------------------------------------------------------
Message no. 19: posted by Dr. Jerrel Yates (math1227a) on Thu Feb 15, 2001 22:52
Subject: WF Course Grade Math 1127 20723 & 20727
If you have not taken test 1 or have not scheduled a
time to take test 1, then you are in danger of receiving
a WF for this course. Please contact me via email
within the next week, if this applies to you.

Dr. Yates
------------------------------------------------------------
Message no. 20: posted by Dr. Jerrel Yates (math1227a) on Fri Feb 16, 2001 11:10
Subject: Feb 17th Online Testing
Reminder. Test 2 will be Saturday, Feb 17th Arnold 204,
11am - 1pm (arrive by noon).

You may also makeup test 1 or take test 3 at this time.

Dr. Yates
------------------------------------------------------------
Message no. 22: posted by Dr. Jerrel Yates (math1227a) on Fri Mar 02, 2001 13:14
Subject: Emails
If you sent me an email between 7 PM Feb 28 and 9 AM
March 1st, I may have missed it.

Dr. Yates
------------------------------------------------------------
Message no. 23: posted by Folayan Brown (brown_folayan) on Thu Mar 08, 2001 12:31
Subject: LAB
Which lab is the one that you want us to do. Is it the
minitab or lab 1 graphics and descriptive data?

------------------------------------------------------------
Message no. 24: [Branch from no. 23]
posted by Dr. Jerrel Yates (math1227a) on Fri Mar 09, 2001 12:58
Subject: re: LAB
Yes. For the lecture class.

Dr. Yates
------------------------------------------------------------
Message no. 25: posted by Dr. Jerrel Yates (math1227a) on Sun Apr 01, 2001 14:02
Subject: Test 4 Lecture Class
Test 4 Lecture class (crn 20723) is Wednesday, April 4,
1-2:15 PM (arrive by 1:15 PM), Arn 204. There will be
space available for Online line students to take their
next test at this time also, just email me to confirm.

Next test date for Online students (crn 20727) is
Saturday, April 21st, 11-1pm, Arn 204. There will be
space available for Lecture Class students to take their
next test at this time also, just email me first to
confirm. Time is running out and we must finish all
lesson quizzes, tests and final exam by May 5th.

Dr. Yates

------------------------------------------------------------
Message no. 26: posted by Dr. Jerrel Yates (math1227a) on Wed Apr 11, 2001 12:13
Subject: Online Normal Table Problem
There is a major problem with my online normal table for
z values greater than 0. Will try to fix before the day
is over (4/11/2001).

Dr. Yates
------------------------------------------------------------
Message no. 27: [Branch from no. 26]
posted by Dr. Jerrel Yates (math1227a) on Wed Apr 11, 2001 15:04
Subject: re: Online Normal Table Problem
The problem with the online normal table has been fixed.
3PM EDT, 04/11/2001

Please contact me if find problems anywhere on this
site.

Dr. Yates
------------------------------------------------------------
Message no. 28: posted by Dr. Jerrel Yates (math1227a) on Sun Apr 15, 2001 17:43
Subject: Test 5 Online Class
</pre>Reminder.

Tests 1-5 for the online class is Saturday, April 21st,
Arn 204, 11-1. Lecture class students can elect to take
test 5 at this time also.

All students must complete Tests 1-5 and the Final
Exam by Saturday, May 5th. Dr. Yates

------------------------------------------------------------
Message no. 29: posted by Dr. Jerrel Yates (math1227a) on Wed May 02, 2001 09:23
Subject: Final Exam Spring 2001
If you are registered for my online class or my lecture
class, you may take the final exam at either of the
times listed below:

Math 1127 Lecture CRN 20723 -- Arnold 204, Fri., May 4
at 12:00-2:00 PM

Math 1127 Online CRN 20727 -- Arnold 204, Sat., May 5
at 11:00 - 2:00 PM (arrive by Noon).

But you must take the final exam and any remaining tests
at one of the times above.

Dr. Yates

------------------------------------------------------------
Message no. 30: posted by Roach Dorothy (roach_dorothy) on Mon May 21, 2001 06:04
Subject: first test and meeting place
I just wanted to make sure of when our first test was, I
know I have it here on a paper, but it escapes me for
the moment. Thanks, Dorotby Roach
------------------------------------------------------------
Message no. 31: [Branch from no. 30]
posted by Dr. Jerrel Yates (MATH1127_50332) on Mon May 21, 2001 11:30
Subject: re: first test and meeting place
Testing will be each Wednesday 6-7 PM in Arnold 204
until July 25th.

Starting June 6th, testing will be each Wednesday 5-7 PM
in Arnold 204 until July 25th.

Dr. Yates
------------------------------------------------------------
Message no. 32: posted by Dr. Jerrel Yates (MATH1127_50332) on Tue May 29, 2001 22:59
Subject: Test Day Again => May 30th
Wed May 30th is test day. 6-7 PM Arnold 204. You need
to take test 1 no later than June 13th. Starting June
6th test time is 5-7 PM. You can take more than one
test on a given day if you have time. Pay close
attention to which lessons need to be completed for a
given test and be sure you have taken the lesson quizzes
for those lessons.

If you have questions, you may come by and ask questions
6-7 in Arn 204 tomorrow also.

Dr. Yates
------------------------------------------------------------
Message no. 33: posted by Dr. Jerrel Yates (MATH1127_50332) on Wed Jun 06, 2001 21:50
Subject: Out of Town

I will be out of town Thur-Sun, June 7-10 and away from
an internet connection. Please post any questions on
the WebCT bulletin board. Someone in class can
probably answer it.

Will try to catch up on any emails and WebCT bulletin
messages Sunday night.

Dr. Yates
------------------------------------------------------------
Message no. 34: posted by Dr. Jerrel Yates (MATH1127_50332) on Fri Jun 15, 2001 13:16
Subject: Test 1
</pre> Hi,

My records show that some of you have not yet taken
test 1. You need to take test 1 by Wednesday, June
20th. The testing time is 5-7 PM, each Wednesday until
July 25th (except July 4th), Arnold 204. Please
complete lesson quizzes 2-5 before test 1 to ensure
that you are prepared. 

If there is problem with the testing time, I should have
been notified earlier. So notify me quickly if there is
a problem with the time. 

Some of you have not given me you home email address.
Until you do, your colstate email address is my official
means of contacting you. 

See you Wednesday. 

Dr. Yates 

-- Jerrel Yates Mathematics Department Columbus
State University Columbus GA 31907 

email:jkyates@mindspring.com web:
http://math.colstate.edu/jyates Math 1127 Online:
http://math.colstate.edu/jyates/Math1127Online/ 
MathDeptWeb:http://math.colstate.edu/ 
------------------------------------------------------------
Message no. 35: posted by Dr. Jerrel Yates (MATH1127_50332) on Fri Jun 15, 2001 13:18
Subject: Testing Time
Testing is now 5-7 PM each Wednesday in Arnold 204. (No
testing on July 4th.) If this time is impossible for
you, please contact me.

Dr. Yates
------------------------------------------------------------

Archive of Bulletin Messages
Jan 2000 - Dec 2000

Compiled Articles.

Article No. 4: posted by Dr. Jerrel Yates on Tue, Jan. 11, 2000, 14:29
Subject: Math 1227 Bulletin

Post your WebCt/ActivStats questions here first. If no one
else in the class is able to answer your question, then
email your instructor.

Article No. 5: posted by Dr. Jerrel Yates on Sat, Jan. 22, 2000, 23:12
Subject: Password Tool

I have put a password tool on the WebCt Math 1227 home
page. If you change your password and forget it, you will
have to email me to get a new password. After you change
your password, no one knows your password but you.

The computer center can not help you with passwords for my
WebCT course.

Article No. 6: [Branch from no. 5] posted by Aurelia D Smith on Tue, Jan. 25, 2000, 22:12
Subject: re: Password Tool

Does this password tool have anything to do with the
passwords put on the tests?

Article No. 7: [Branch from no. 6] posted by Karen M Depineuil on Wed, Jan. 26, 2000, 14:24
Subject: re: Password Tool

I think that the password tool was just to give you the
opportunity to change your password since you were
originally using the last 6 digits of your social security
number.

Article No. 9: [Branch from no. 7] posted by Dr. Jerrel Yates on Thu, Jan. 27, 2000, 03:28
Subject: re: Password Tool

That is correct. ==Dr. Yates

Article No. 8: posted by Jennifer N McCormick on Thu, Jan. 27, 2000, 02:23
Subject: test date

is the test date still for monday jan 31 as listed in the
schedule?

Article No. 10: [Branch from no. 8] posted by Dr. Jerrel Yates on Thu, Jan. 27, 2000, 03:32
Subject: re: test date

The test is during week 4 which starts on Jan 31. Test
date is Thursday, Feb 3rd at 5 PM in Arnold 201. See
WebCT/Calendar. Dr. Yates

Article No. 11: posted by Joseph Q Davidson on Tue, Feb. 1, 2000, 04:16
Subject: Lesson 5 lecture notes

Just curious if anyone else noticed the lecture notes for
lesson five are not there and an error message appears.

Article No. 14: [Branch from no. 11] posted by Dr. Jerrel Yates on Tue, Feb. 1, 2000, 15:10
Subject: re: Lesson 5 lecture notes

I am also curious. I could not replicate the error.
Anybody able to get this error let us know.

Article No. 16: [Branch from no. 14] posted by Karen M Depineuil on Wed, Feb. 2, 2000, 00:20
Subject: re: Lesson 5 lecture notes

I was able to access(twice) and print lecture 5 lesson
notes with no error messages.

Article No. 17: [Branch from no. 11] posted by Dr. Jerrel Yates on Wed, Feb. 2, 2000, 14:18
Subject: re: Lesson 5 lecture notes

I found and problem and fixed it. One path would not
connect to the lesson 5 notes.

Article No. 12: posted by Tammy L Clark on Tue, Feb. 1, 2000, 05:02
Subject: test

Dr. Yates, What exactly do we need to bring for the
test. Are we allowed to bring our own calculator, I find
mine much easier to use. Is a formula sheet allowed?

Article No. 13: [Branch from no. 12] posted by Dr. Jerrel Yates on Tue, Feb. 1, 2000, 15:02
Subject: re: test

You may bring to the test
1. Any type of calculator.
2. A 3x5 card with anything you want to put on the card.
3. Clean sheets of paper for scratch work during the test.

I will furnish the normal tables for you.

Article No. 15: posted by Dr. Jerrel Yates on Tue, Feb. 1, 2000, 17:36
Subject: Test Place, Date and Times

Place: Arnold 201.

Test date is Thursday, February 3rd 5-6 PM. Some of you
can not come until you get out of class at 5:45. That is
ok, just try to be there by 6 PM.

Alternate date and time: Friday February 4th, 11:00 AM.

Article No. 18: [Branch from no. 15] posted by Karen M Depineuil on Thu, Feb. 3, 2000, 12:49
Subject: re: Test Place, Date and Times

Dr Yates,I will have to attend the alternate test date on
Friday, Feb. 4 @ 11:00 am- see you then.

Article No. 19: [Branch from no. 15] posted by Nettie L Harris on Thu, Feb. 3, 2000, 14:45
Subject: re: Test Place, Date and Times

Dr. Yates: I will have to attend the alternate test date on
Friday, February 4th at 11:00 a.m.

Article No. 20: posted by Dr. Jerrel Yates on Fri, Feb. 4, 2000, 19:12
Subject: Test 1 Scores Adjusted

Test 1 scores have been adjusted by multiplying by 1.08
and have been stored as Test 1 ADJ.
You may view the adjusted grade from WebCT=>Check Grades.
You can also view the distribution at the same time.
Only students who took test 1 are in the distribution.
Below is a stem and leaf plot of the adjusted scores.

4 3
5 26
6 007999
7 88888
8 666
9 5555
10 4

Article No. 21: posted by Dr. Jerrel Yates on Fri, Feb. 4, 2000, 19:17
Subject: WebCT Quizzes 2-5

WebCT Quizzes 2-5 will not be available after 2/7/00. Your
score will be a zero on each untaken quiz.

Article No. 22: posted by Christopher S Blanchard on Thu, Feb. 10, 2000, 13:31
Subject: Final Grades

Dr. Yates, Can you explain to me how the final grades are
going to be calculated?

Article No. 23: [Branch from no. 22] posted by Dr. Jerrel Yates on Thu, Feb. 10, 2000, 14:48
Subject: re: Final Grades

Course Grade

Lesson Quizzes: 10 Percent. A zero will be recorded for
any lesson quiz missed. Lesson quizzes will be available
online on WebCT (see logging onto WebCT). The lessons
quizzes may be taken up to 5 times. Your best score is
your grade for that lesson quiz. These lessons quizzes
test the homework material assigned for each given lesson.

Other Tests: 90 Percent. There will be 5 regular tests
(see calendar for times) and a final exam. The final exam
will count as two regular tests. This will give a total of
7 test scores. One of those test scores may be dropped.
If any regular test is missed, then your score on the final
will be substituted. For each regular test and final exam,
a 3x5 note card may be used and any calculator. All
necessary tables will be furnished. Tests will be closed
book and particularly closed ActivStats. I.e., don't bring
your ActivStats to any regular test or final exam.

Final average = 0.1*(Lesson Quiz Average) + 0.9*(Test 1
Score + Test 2 Score + ... + Test 5 Score + Final Exam
Score + Final Exam Score - Lowest Score)/6

Article No. 24: posted by Dr. Jerrel Yates on Mon, Feb. 14, 2000, 21:06
Subject: Feb 15th

I will be undergoing a medical procedure on Tues morning,
Feb 15.tomorrow. Do not expect me to be lucid until that
afternoon.

Article No. 25: posted by Tammy L Clark on Wed, Feb. 16, 2000, 14:39
Subject: test

Dr. Yates

is there still a test this week? If so, at what time?

Article No. 26: [Branch from no. 25] posted by Dr. Jerrel Yates on Wed, Feb. 16, 2000, 21:43
Subject: re: test

Reminder. For the test tomorrow, Feb 17th and alternate
date Feb 18th, see the Calendar for specific times. The
times are the same as last time.

Article No. 27: posted by Christopher S Blanchard on Thu, Feb. 17, 2000, 01:05
Subject: X suscript i

In lesson 8, in the correlation formula, what does the
character X subsript i and Y subscript i stand for? What
would you plug in sor these variables?

Article No. 28: posted by Tammy L Clark on Thu, Feb. 17, 2000, 02:23
Subject: re: subscript

The subscripts represent the variables which fall on the
x-axis and y-axis. Problem 8.1: X1=38, X2=56, Y1=41, Y2=63,
etc..

Article No. 29: [Branch from no. 28] posted by Dr. Jerrel Yates on Thu, Feb. 17, 2000, 03:19
Subject: re: re: subscript

Good answer.

The x sub i are the data values for the explanatory
variable and the corresponding y sub i are the data values
for the response variable. I.e., (xi, yi) is a data pair.
For example

x: 2 4 6 y: 3 6 5

x1 = 2, y1 = 3 x2 = 4, y2 = 6 x3 = 6, y3 = 5

Article No. 30: posted by Donna E Cantrell on Thu, Feb. 17, 2000, 17:31
Subject: test

I know there is a test today at 5, but when is the
alternate date and time?

Article No. 31: [Branch from no. 30] posted by Dr. Jerrel Yates on Thu, Feb. 17, 2000, 19:35
Subject: re: test

See the calendar. Fri morn at 11:00 Arnold 201 Feb 18th.

Article No. 32: posted by Joseph Q Davidson on Thu, Feb. 17, 2000, 19:53
Subject: alternate time

Is there any other time tomorrow to make up the test. I
have a lab at 11:00 and cannot miss it. Any other time?

Article No. 33: [Branch from no. 32] posted by Dr. Jerrel Yates on Fri, Feb. 18, 2000, 03:29
Subject: re: alternate time

If you had contacted me earlier, I would have tried to work
with you. There is no other time this week. If you come
by my office on Monday between 11-12:30, we will discuss it.

Article No. 34: posted by Karen M Depineuil on Fri, Feb. 18, 2000, 23:15
Subject: Lecture Notes/Assignments

Dr. Yates, when can we expect for lecture notes/assignments
on chapter 10 and forward to be available? I am unable to
retrive them as of now.

Article No. 35: [Branch from no. 34] posted by Dr. Jerrel Yates on Sat, Feb. 19, 2000, 05:21
Subject: re: Lecture Notes/Assignments

I will try to get some of those loaded this weekend. The
lesson quiz for lessons 10 and 11 is loaded and randomly
selects 10 questions from 20 questions. Let me know if my
software scrambled any of the questions.

Article No. 36: posted by Dr. Jerrel Yates on Sun, Feb. 20, 2000, 01:36
Subject: IQScoresSeventhGraders

The attached data is for problem 10.8 from Moore's APS.

Article No. 37: posted by Megan C Leathers on Mon, Feb. 21, 2000, 20:22
Subject: Ch. 10-11 quiz

Is there supposed to be a password to access this quiz?
Where are the Lecture Notes after Chapter 9? Thank You!
Megan Leathers

Article No. 38: [Branch from no. 37] posted by Dr. Jerrel Yates on Tue, Feb. 22, 2000, 04:06
Subject: re: Ch. 10-11 quiz

Oops. There isn't one now.

Lesson 10 and 11 are combined into one called Surveys and
Experiments. Lessons 12-13 are combined into Randomness
and Probability.

Article No. 39: posted by Dr. Jerrel Yates on Tue, Feb. 29, 2000, 21:51
Subject: Reminder: Test 3

Test 3 is scheduled for March 16th and 17th. See calendar
for times and place. Get in touch with me prior to March
15 if there is problem with the test dates/times. Refer to
my Lecture notes for the problems on sample proportions.

Article No. 41: [Branch from no. 39] posted by Dr. Jerrel Yates on Thu, Mar. 2, 2000, 14:46
Subject: re: Reminder: Test 3

Additional note. Not many people have attempted the last
three lesson quizzes. If you are having problems, you need
to post your questions here so that I or your class mates
can respond. If you wait to the last minute, you almost
certainly will not have time to learn the material well
enough for a good score on test 3. Lesson 16 on the
Central Limit Theorem is extremely important. We will be
using it for the rest of the semester as well as the
material on the normal distribution in Lesson 5.

Have a nice break. I may not check my mail everyday during
the break.

Article No. 40: posted by Dr. Jerrel Yates on Tue, Feb. 29, 2000, 21:54
Subject: Deadline for Withdrawal

The deadline for withdrawal for this semester is March 1st.
If you are not participating, then you need to withdraw
immediately.

Article No. 42: posted by Nettie L Harris on Sun, Mar. 12, 2000, 21:02
Subject: HELP!

Sample proportion problem. A survey asks adults if they
like ice cream. Assume that the proprtion of adult in the
population who like ice cream is 0.9. Assume that 1600
adults are asked if they like ice cream. What is the
chance the sample proprotion is between .89 and .91?

Article No. 43: [Branch from no. 42] posted by Dr. Jerrel Yates on Mon, Mar. 13, 2000, 03:15
Subject: re: HELP!

Solution: To compute the chance, we use the normal distribution
with mean mu = p = 0.9 and standard deviation sigma = sqrt(.9*.1/1600) = 0.0075.

The z-score for .89 is (.89 - .90)/0.0075 = -1.33.
The z-score for .91 is (.91 - .90)/.0075 = 1.33

The area to the left of z = 1.33 is .9082
The area to the left of z = -1.33 is 0.0918

The area between z = -1.33 and z = 1.33 is .9082 - .0918 = 0.8164

Answer is .8164 or about 82%.

Article No. 44: posted by Nettie L Harris on Tue, Mar. 14, 2000, 03:27
Subject: Quiz Problems

Sample proportion problem. An unfair coin has a 40% chance
of coming up head when tossed. This coin is tossed 900
times. What is the standard deviation of the distribution
of the sample proportion? Enter your answer to the nearest
thousandth.

_____________

Sample proportion problem. An unfair coin has a 40% chance
of coming up head when tossed. This coin is tossed 900
times. What is the chance that the sample proportion of
heads will obtain between .40 and .42? Express your answer
between 0 and 1. Enter your answer to two decimal places.

_________________

A simple random sample of size 456 is drawn from a large
population with population mean m = -63 and population
standard deviation s = 14. What is the standard deviation
of the sampling distribution of the mean? Enter your answer
to the nearest hundredth.

________________

Article No. 45: [Branch from no. 44] posted by Dr. Jerrel Yates on Tue, Mar. 14, 2000, 04:07
Subject: re: Quiz Problems

sqrt is notation which means: take the square root of.

First.
Standard deviation for a sample proportion = sqrt[p*(1-p)/n] = sqrt(.4*.6/900) = .01633.

Use the normal distibution with mean mu = .4
and standard deviation sigma = 0.01633.
Ans to nearest thousandth is 0.01633
__________________________________________________________
Second.
z-score for .42 is (.42 - .40)/.016 = 1.25
z-score for .40 is (.40 - .40)/.016 = 0

Area to left of z = 1.25 is 0.8944
Area to left of z = 0 is 0.5000

Area between z = 0 and z = 1.22 is .8944 - .5000 = 0.3944

Answer to nearest hundredth is 0.39.

_______________________________________________________________
Third.
Sample size = 456 and population standard deviation = 14

n = 456 and sigma.
Sampling standard deviation = sigma/sqrt(n)
Sampling standard deviation = 14/sqrt(456) = 0.6556

Answer to two decimal places is 0.66

Article No. 46: [Branch from no. 45] posted by Dr. Jerrel Yates on Tue, Mar. 14, 2000, 18:00
Subject: re: Quiz Problems

In article 45 on Tue, Mar. 14, 2000, 04:07, Dr. Jerrel
Yates writes:
>sqrt is notation which means: take the square root of.
>
>First.
>Standard deviation for a sample proportion = sqrt[p*(1-p)/n] = sqrt(.4*.6/900) = .01633.
>
>Use the normal distibution with mean mu = .4
>and standard deviation sigma = 0.01633.
>Ans to nearest thousandth is 0.01633

Clearly 0.01633 rounded to the nearest thousandth is 0.016

Article No. 47: posted by Dr. Jerrel Yates on Thu, Mar. 16, 2000, 03:39
Subject: Problem 13.14 APS

Ms. Levy,

Could you post this in the bulletin board and I will
respond to it there.

Dr. Yates

Trueblue38@aol.com wrote:

I have a couple of questions about two problems from some
of the practice assignments you gave us. Today I went to
the Math lab and Ms. Dockery and another lady were unable
to figure it out either. They are the two sampling
proportion problems, 13.14 and 15.6.Is this something you
can explain on e-mail or do you have any time tommorow
after 12:15 when I get out of class? Thank-you, Lisa Levy

Article No. 48: [Branch from no. 47] posted by Dr. Jerrel Yates on Thu, Mar. 16, 2000, 04:11
Subject: re: Problem 13.14 APS

Note: Other solutions to sample proportion problems can be found
in the lecture notes and a previous post to this bulletin board.

The proportion, p, of successes in the population is 30%, or 0.3
The standard deviation of the distribution of the sample
proportion is sqrt[p(1-p)/n], where n is the sample size.

For calculating probabilities for a sample proportion,
use a normal distribution with mean mu = p = 0.3 and
Standard deviation sigma = sqrt[p*(1-p)/n] = sqrt[.3*.7/400] = .022913 or round to 0.023.

a) What is the chance that at least half of the sample
believes that drugs are the school's most serious problem.

Translation: What is the chance that the sample proportion is greater than or equal to 0.5.

The z-score for 0.5 is (0.5 - 0.3)/.023 = 8.70
Area to the left of z = 8.70 is essentially 1.000 (Table stops at z = 3.49)

Area to the right of z = 8.70 is essentially 0.

Rules to follow for z-scores not in the normal table.
If the z-score is greater than 3.49, take the area to the left of z to be 1.
If the z-score is less than -3.49, take the area to the left of z to be 0.

(b) Chance that sample proportion is less than 25% (0.25).
z-score for 0.25 is (.25 - .3)/0.023 = -2.17
Area to the left of z = -2.17 is .0150
Answer is about 0.0150 or 1.5%.

(c) Chance that sample proportion is between 0.25 and 0.35.
z-score for 0.35 is (.35 - .3)/0.023 = 2.17
Area to left of z = 2.17 is .9850
Area to left of z = -2.17 is .0150
Area between z = -2.17 and z = 2.17 = .9850 - .0150 = 0.97.

Answer is about .97 or 97%.

Article No. 49: posted by Dr. Jerrel Yates on Sun, Mar. 19, 2000, 21:07
Subject: Lesson 17 Quiz

The Lesson 17 quiz is ready for you. More may be added
later but there are plenty of computational problems to
hone your computational skills for confidence intervals.

The class average for Test 3 was 84. Good WORK.

Article No. 50: posted by Dr. Jerrel Yates on Sun, Mar. 19, 2000, 21:51
Subject: Final Exam

The date for the final exam for this class is Monday, May
1st. The alternate date for the final is Tuesday, May 2nd.

For both dates: Final exam 4-7 PM in Arnold 201. Must begin
by 6 PM. Scores will be released once your exam is graded.
But the exams themselves will not be released.

If you cannot make either of those dates at the specified
times, contact me prior to May 1st.

Article No. 51: posted by Karen M Depineuil on Mon, Mar. 20, 2000, 23:55
Subject: ch 17,18 lecture notes

Dr. Yates, can we expect any of your lecture notes for
chapters 17 + 18? Thanks...KD

Article No. 52: [Branch from no. 51] posted by Dr. Jerrel Yates on Tue, Mar. 21, 2000, 04:07
Subject: re: ch 17,18 lecture notes

Maybe by Friday after the lesson quiz for lesson 18 is
finished. The material on the confidence intervals should
be fairly straight forward. But some examples on the
t-distribution should be helpful.

Article No. 53: posted by Karen M Depineuil on Mon, Mar. 27, 2000, 02:35
Subject: chapter 18 quiz

Dr. Yates, please check my second attempt at chapter 18
quiz, questions 8 and 9- I keep getting the same answers
and am not sure why they have been marked wrong. Thanks,KD

Article No. 54: [Branch from no. 53] posted by Dr. Jerrel Yates on Mon, Mar. 27, 2000, 03:22
Subject: re: chapter 18 quiz

In article 53 on Mon, Mar. 27, 2000, 02:35, Karen M
Depineuil writes:
>Dr. Yates, please check my second attempt at chapter 18
>quiz, questions 8 and 9- I keep getting the same answers
>and am not sure why they have been marked wrong. Thanks,KD

The problem. A simple random sample of 10 students are
selected and their average on the SAT Math is computed. The
sample standard deviation s = 85. Use the t-distribution to
compute the margin of error m for a 80% confidence
interval. Enter your answer to the nearest tenth. Recall
that for a critical value t*, the margin of error m is
given by m = t*s/sqrt(n).

Ms. Depineuil,

If df = 9 and CL = 80%, then t* = 1.383. You took t* from
the bottom row (1.282, where df = infinity). Go the row
where df = n - 1 = 9.

Dr. Yates

Article No. 55: posted by Nettie L Harris on Mon, Mar. 27, 2000, 16:39
Subject: Quiz Problem

Dr. Yates:

A SRS of 95 students are selected and their avg on the SAT
mAth is computed. Stan Dev = 76. Compute the margin of
error for a 99.5% confidence interval. m = 2.81
76/sqrt 95 m = 2.81 76/9.746 m = 21.9 = 22 Is this
correct? if not, please advise of mistakes.

Article No. 56: [Branch from no. 55] posted by Dr. Jerrel Yates on Tue, Mar. 28, 2000, 03:09
Subject: re: Quiz Problem

In article 55 on Mon, Mar. 27, 2000, 16:39, Nettie L Harris
writes:
>Dr. Yates:
>
>A SRS of 95 students are selected and their avg on the SAT
>mAth is computed. Stan Dev = 76. Compute the margin of
>error for a 99.5% confidence interval. m = 2.81
>76/sqrt 95 m = 2.81 76/9.746 m = 21.9 = 22 Is this
>correct? if not, please advise of mistakes.

Ms. Harris,

22 is not the correct answer, however 21.9 is the correct
answer. Do not round until finished. m = 21.8874. Round
to the nearest tenth and the correct answer rounded to the
nearest tenth is 21.9.

I allow a small percentage error in the calculation so 22
might (or might not) be acceptable. But it is not the
correct answer rounded to the nearest tenth.

Dr. Yates

Article No. 57: posted by Dr. Jerrel Yates on Wed, Mar. 29, 2000, 21:23
Subject: Test 4 and WebCT

Today WebCT did something very strange. A student took a
test and submitted it but the test did not show up on my
computer. WebCT seemed to have completely ignored the
submission.

I will pass out a roll for you to sign while you are taking
the test. When you start a test, it shows up on my
computer as "in progress". If you do not show up on my
computer, let's catch it sooner rather than later.

Also, check your lesson quiz scores. If some of those,
which you took and submitted, do not appear, email me or
respond to this thread.

If you are submitting quizzes, you must have java enabled
on your browser. Java should be enabled on all the
browsers in the computer labs.

Article No. 58: posted by Nathaniel P Shuler on Tue, Apr. 18, 2000, 13:32
Subject: quiz question

Question 12 (9 points) A very large schoool system
wishes to know how it compares to the national average on
the SAT Math. The national average is m = 600, the
population standard deviation is s = 109. They believe that
their students average is different from the national
average. A SRS of 39 students is chosen and their average
on the SAT Math is found to be 613. The null and
alternative hypothesis are: H0: m = 600 Ha: m ¹ 600

Calculate the P-value for this test. Round your answer to
the nearest thousandth. Answer should be between 0 and 1.
Note: WebCT answer may be off by a few thousandths but the
tolerance is set to handle those discrepancies. Student
Response: .770 Correct Answer: 0.456

Score: 0.0 / 9.0

how do you calculate when H :mu doesn't =

Article No. 59: [Branch from no. 58] posted by Dr. Jerrel Yates on Tue, Apr. 18, 2000, 14:11
Subject: re: quiz question

In article 58 on Tue, Apr. 18, 2000, 13:32, Nathaniel P
Shuler writes:
>Question 12 (9 points) A very large schoool system
>wishes to know how it compares to the national average on
>the SAT Math. The national average is m = 600, the
>population standard deviation is sigma = 109. They believe that
>their students average is different from the national
>average. A SRS of 39 students is chosen and their average
>on the SAT Math is found to be 613. The null and
>alternative hypothesis are: H0: mu = 600 Ha: mu not equa to 600
>
>Calculate the P-value for this test. Round your answer to
>the nearest thousandth. Answer should be between 0 and 1.
>Note: WebCT answer may be off by a few thousandths but the
>tolerance is set to handle those discrepancies. Student
>Response: .770 Correct Answer: 0.456
>
>Score: 0.0 / 9.0
>
>how do you calculate when H :mu doesn't =

Compute the value in one tail and double it.

z = (613-600)/(109/sqrt(39)) = 13/17.454 = 0.7448 Area in
upper tail = 1 - area z < .7488 = 1 - .7704 = .2296 Double
this value to get P-value = .4592 Due to rounding our value
is a little different from WebCt's

Dr. Yates

Article No. 60: posted by Megan C Leathers on Wed, Apr. 19, 2000, 15:28
Subject: Chapter 19 Quiz and P-value

Dr. Yates I am having trouble with the P-value. I thought
that I was doing it correctly per the formula on your
lecture notes. However, half of the quiz questions were
correct and the others were incorrect. Can you please see
what it is that I am doing wrong? (I am assuming that you
have access to open my quizzes). Thanks.

This problem is keeping from getting any further-I am stuck!

Article No. 62: [Branch from no. 60] posted by Dr. Jerrel Yates on Thu, Apr. 20, 2000, 04:11
Subject: re: Chapter 19 Quiz and P-value

In article 60 on Wed, Apr. 19, 2000, 15:28, Megan C
Leathers writes:
>Dr. Yates I am having trouble with the P-value. I thought
>that I was doing it correctly per the formula on your
>lecture notes. However, half of the quiz questions were
>correct and the others were incorrect. Can you please see
>what it is that I am doing wrong? (I am assuming that you
>have access to open my quizzes). Thanks.
>
>This problem is keeping from getting any further-I am stuck!

You need to move on. P-values are important but the other
quizzes are also very important. Below is a paste of two
problems that you missed.

Question 1 (9 marks)

A very large high school wishes to know how it compares to
the national average on the SAT Math. The national average
is m = 600, the population standard deviation is sigma =
88. They believe that their students are scoring above the
national average. A SRS of 39 students is chosen and their
average on the SAT Math is found to be 632. The null and
alternative hypothesis are: H0: m = 600 Ha: m > 600

Calculate the P-value for this test. Round your answer to
the nearest thousandth. Answer should be between 0 and 1.
Note: WebCT answer may be off by as much as a few
thousandths but the tolerance is set to handle those
discrepancies.

Student Response: .988 Correct Answer: 0.012

Score: 0.0 / 9.0

Solution. ==========================================

Standard dev for sampling dist = sigma/sqrt(n) =
88/sqrt(39) = 14.091

z = (632-600)/14.091 = 32/14.091 = 2.27.

We want the area in the upper tail which is 1 - area z <
2.27.

Area = 1 - .9884 = 0.0113 P-value = area in upper tail =
.0113

You got the area for (z < 2.27). The area in the upper
tail is 1 - area z < 2.27.
======================================================

Another problem.

Question 3 (9 marks)

A very large schoool system wishes to know how it compares
to the national average on the SAT Math. The national
average is m = 600, the population standard deviation is s
= 91. They believe that their students average is different
from the national average. A SRS of 31 students is chosen
and their average on the SAT Math is found to be 605. The
null and alternative hypothesis are: H0: m = 600 Ha: m not
equal to 600

Calculate the P-value for this test. Round your answer to
the nearest thousandth. Answer should be between 0 and 1.
Note: WebCT answer may be off by a few thousandths but the
tolerance is set to handle those discrepancies.

Student Response: .622 Correct Answer: 0.760

Score: 0.0 / 9.0

Solution.========================================

This is two tailed. Find the area in one tail and multiply
by 2 to get the P-value.

standard dev. for sampling dist = sigma/sqrt(n) =
91/sqrt(31) = 16.344

z = (xbar - mu)/(stand. dev for sampling dist) =
(605-600)/16.344 = .3059 or about .31

Area in upper tail = 1 - area z < .31 = 1 - .6217 = .3783
P-value = 2 times .3783 = .7566

Note. Upper tail for this one is z > .31. Lower tail is z
< -.31. If we double the value for z < -.31, P-value = 2
times .3783 = .7566. It does not matter which tail we take,
just double the area for tail.

You got the area for z < .31. That is neither a lower tail
nor an upper tail for the two tail region.

Hope this helps.

Dr. Yates

Article No. 61: posted by Nettie L Harris on Wed, Apr. 19, 2000, 22:53
Subject: Problem w/ level of significance

Dr. Yates: I'm having problems with this one! Please
explain.

A very large school system wishes to know how it compares
to the national average on the SAT Math. The national
average is m = 600. The population standard deviation is s
= 110.They believe that their students are scoring below
the national average. A SRS of 15 students is chosen and
their average on the SAT Math is found to be 570. The null
and alternative hypothesis are: H0: m = 600 Ha: m < 600

If the level of significance a = .05, what is the critical
value z* for the critical region?

1. -1.282 2. -1.645 3.
1.645 4.1.96

Article No. 63: [Branch from no. 61] posted by Dr. Jerrel Yates on Thu, Apr. 20, 2000, 04:24
Subject: re: Problem w/ level of significance

In article 61 on Wed, Apr. 19, 2000, 22:53, Nettie L Harris
writes:
>Dr. Yates: I'm having problems with this one! Please
>explain.
>
>A very large school system wishes to know how it compares
>to the national average on the SAT Math. The national
>average is m = 600. The population standard deviation is s
>= 110.They believe that their students are scoring below
>the national average. A SRS of 15 students is chosen and
>their average on the SAT Math is found to be 570. The null
>and alternative hypothesis are: H0: m = 600 Ha: m < 600
>
>If the level of significance a = .05, what is the critical
>value z* for the critical region?
>
>
> 1. -1.282 2. -1.645 3.
>1.645 4.1.96

Solution. This is a one tail region (lower tail). The
critical value will be negative. We can use the table for
confidence intervals to find the postive value.

The area to the right of z* is .05. The area to the left
of -z* is .05. So the area between z* and -z* is .90 or
90%. We need to find z* for a 90% confidence interval.
Look in you t-dist table for z* for 90% confidence
interval. We find the value is 1.645, which is our -z*.
But we need z* to be negative. The correct answer is
-1.645.

The other way to solve this problem is find z* in the
normal table so that the area z < z* is .05.

Candidates are: z* = -1.65. area z < -1.65 is .0495 z* =
-1.64. area z , -1.64 is .0505 Our value is about half-way
between, so take z* = -1.645. Which in this case is the
same as that given by Table B. Usually, Table B is more
accurate.

Hope this helps.

Dr. Yates

Article No. 64: posted by Nathaniel P Shuler on Thu, Apr. 20, 2000, 13:38
Subject: quiz 20 ?s

Question 5 (11.2 points) A very large school system wishes
to know how it compares to the national average on the SAT
Math. The national average is m = 600. The population
standard deviation is unknown but the sample standard
deviation s = 110. They believe that their students are
scoring above the national average. A SRS of 15 students is
chosen and their average on the SAT Math is found to be
660. The null and alternative hypothesis are: H0: m = 600
Ha: m > 600

If the level of significance a = .02, is this result
significant? 100.0% 1. Yes 0.0% 2. No

I'm a little unsure of how to determine significance on t*
and z*.

A very large school system wishes to know how it compares
to the national average on the SAT Math. The national
average is m = 600. The population standard deviation is
unknown but the sample standard deviation s = 110. They
believe that their students average is different from the
national average. A SRS of 10 students is chosen and their
average on the SAT Math is found to be 570. The null and
alternative hypothesis are: H0: m = 600 Ha: m ¹ 600

If the level of significance a = .02, what is the critical
value t* for the critical region? 100.0% 1. -2.821 0.0%
2. -2.398 0.0% 3. 2.398 100.0% 4. 2.821 0.0% 5.
3.250

How does not = work with t*?

Article No. 65: [Branch from no. 64] posted by Dr. Jerrel Yates on Thu, Apr. 20, 2000, 15:22
Subject: re: quiz 20 ?s

In article 64 on Thu, Apr. 20, 2000, 13:38, Nathaniel P
Shuler writes:
>Question 5 (11.2 points) A very large school system wishes
>to know how it compares to the national average on the SAT
>Math. The national average is m = 600. The population
>standard deviation is unknown but the sample standard
>deviation s = 110. They believe that their students are
>scoring above the national average. A SRS of 15 students is
>chosen and their average on the SAT Math is found to be
>660. The null and alternative hypothesis are: H0: m = 600
>Ha: m > 600
>
>If the level of significance a = .02, is this result
>significant? 100.0% 1. Yes 0.0% 2. No
>
>I'm a little unsure of how to determine significance on t*
>and z*.
>
===========================================================
This one is one is for the t-distribution. The number of
degrees of freedom is 14. The area above the critical
value, t*, is .02. In the t-dist table, go to the column
labled .02 and go to the row with df=14, t* = 2.262. Now
compute the t-value for the test statistic.

t = (xbar - mu)/(sigma/sqrt(n)) = (660 -
600)/(110/sqrt(15)) = 2.11

To be significant, t must be in the critical region, ie. t
must be greater than t*. But 2.11 is not greater than
2.262, so the result is NOT SIGNIFICANT.

Sorry, I GOOFED on the answer for this one. One of my
normal questions slipped into the wrong category.

===========================================================
If this had been a normal distribution, then find z* in the
following manner. You may use table B (t-dist table) this
way. The critical z value z* has .02 area above it. This
means -z* has .02 area below it. So, the area between -z*
and z* is .96. Look up z* for a 96% confidence interval
in your table. You find z* = 2.054. Compute the z-score,
z, for the test statistic. The result is significant if z
> z* for an upper tail test.

z = (xbar - mu)/(sigma/sqrt(n)) = (660 -
600)/(110/sqrt(15)) = 2.11

So this result is significant if the distribution is
normal.

================================================================================

Article No. 66: [Branch from no. 64] posted by Dr. Jerrel Yates on Thu, Apr. 20, 2000, 15:30
Subject: re: quiz 20 ?s

>A very large school system wishes to know how it compares
>to the national average on the SAT Math. The national
>average is m = 600. The population standard deviation is
>unknown but the sample standard deviation s = 110. They
>believe that their students average is different from the
>national average. A SRS of 10 students is chosen and their
>average on the SAT Math is found to be 570. The null and
>alternative hypothesis are: H0: m = 600 Ha: m not equal to 600
>
>If the level of significance a = .02, what is the critical
>value t* for the critical region? 100.0% 1. -2.821 0.0%
> 2. -2.398 0.0% 3. 2.398 100.0% 4. 2.821 0.0% 5.
>3.250
>
>
>How does not = work with t*?

>
==============================================================================
Solution. For not equal the critical region consists of two
tails, upper and lower. An upper or lower tail does not
contain t = 0. The area in the two tails is alpha or .02.
So the area in the upper tail is .01. Use the t-dist
table. Locate column .01 and find row with df = 9, you
should find t* = 2.821 there.

Final answer is t* = 2.821.

Dr. Yates

Article No. 114: [Branch from no. 64] posted by Dr. Jerrel Yates on Fri, Jun. 30, 2000, 16:55
Subject: re: quiz 20 ?s

1. Could explain what makes "significant" significant.

I know how to get "z" and how to look up "t" on chart but I
do not know how to compare for significance. If you could
explain, I would appreciate it. Example:

2. (570-600; SD= 110; SRS= 15; Ha:u< 600; a= .02) -1.056
(z) 2.264 (t) Why is this not significant? (+ -)1.056 does
not fall between (+ - ) 2.264. Is this why?

3. (540-600; SD= 110; SRS= 20; Ha:u< 600; a= .02) -2.439
(z) 2.205, 2.539 (t) Why is this significant? ( + -) 2.439
(z) falls between (+ - ) 2.205. Is this why?

4. (540-600, SD= 110; SRS= 20; Ha:u (difference) 600; a=
.02) -2.439 (z) 2.205, 2.539 (t) Why is this not
significant? I do not understand how to determine the
(different) hypothesis. (I do not have the sign that
applies to difference).

The last two examples above are the same problems except
for the hypothesis of (below or different). Please
explain what or if I am wrong about first two examples,
and how to find the significance to the third example.

Answer. See:
http://math.colstate.edu/jyates/Math1227Online/lectures/lesson20/questions/lesson20questions.htm

Article No. 67: posted by Aurelia D Smith on Thu, Apr. 20, 2000, 20:32
Subject: Quiz 19b

Regarding the smart and dumb mice,

why is the alternative hypothesis for smarter: ha < 24 and
for dumber than average : ha > 24

???

That is how the quiz is grading it. What am I missing? With
the ball bearings it wasn't like that.

Article No. 68: [Branch from no. 67] posted by Dr. Jerrel Yates on Fri, Apr. 21, 2000, 00:24
Subject: re: Quiz 19b

In article 67 on Thu, Apr. 20, 2000, 20:32, Aurelia D Smith
writes:
>Regarding the smart and dumb mice,
>
>why is the alternative hypothesis for smarter: ha < 24 and
>for dumber than average : ha > 24
>
>???
>
>That is how the quiz is grading it. What am I missing? With
>the ball bearings it wasn't like that.
============================================================

Answer. The 24 is time. If a mouse is smarter, the mouse
takes less time to go through the maze. If the mouse is
dumb, it should take more time to go through the maze.

Dr. Yates

Article No. 69: posted by Dr. Jerrel Yates on Fri, Apr. 21, 2000, 17:24
Subject: Lecture notes for lesson 20

The lesson 20 lecture notes should be accessible from WebCT
now. They were already accessible thru my Math127Online
web site (http://math.colstate.edu/jyates/Math1227Online/
).

Dr. Yates

Article No. 70: posted by Dr. Jerrel Yates on Fri, Apr. 21, 2000, 17:38
Subject: Lesson Quizzes

All lesson quizzes are available. Even if you have taken
the quiz five times, you may click on one of the tries to
see the questions (and your answers). I will download the
scores for your lesson quizzes on May 3rd and compute the
average. I.e., if you have not taken one of the quizzes
five times and wish to improve your score, you have until
May 2nd to do so.

I will try to have lecture notes and a lesson quiz for
lesson 21 by Monday, April 24th. Some suggested
assignments have already been posted.

Dr. Yates

Article No. 71: posted by Dr. Jerrel Yates on Fri, Apr. 21, 2000, 17:40
Subject: Final Exam

There will be 4-6 questions from lesson 21. There will be
14-16 questions from all the previous lessons covered.

Dr. Yates

Article No. 75: [Branch from no. 71] posted by Dr. Jerrel Yates on Thu, Apr. 27, 2000, 15:54
Subject: re: Final Exam

You may turn in your scratch work for the final. This may
enable me to give you partial credit on some of the
problems you miss. Remember to number each question on
your scratch work. Neatness counts. If I cannot read it,
then there is no possibility of partial credit.

Also, remember to write your name on any scratch work
turned in.

Monday, May 1 Final Exam. 4-7 PM. Must begin by 6 PM. OR
Tuesday, May 2 Final exam. 4-7 PM. Must begin by 6 PM.

Article No. 73: posted by Christopher S Blanchard on Tue, Apr. 25, 2000, 13:52
Subject: test

Dr. Yates, Will our tests be avialable for us to study for
our finals.

Article No. 74: [Branch from no. 73] posted by Dr. Jerrel Yates on Tue, Apr. 25, 2000, 17:50
Subject: re: test

Just the lesson quizzes will be available. Most all of
your test questions will be identical to those questions or
very similar.

Dr. Yates

Article No. 76: posted by Dr. Jerrel Yates on Thu, Apr. 27, 2000, 16:04
Subject: WebCT / Course Evaluation

A survey has been posted on the quiz page for WebCT/Course
Evaluation. Your comments are important. Please a take a
few minutes and complete this form. If a survey question
is confusing or you think a survey question has been
omitted, then include that information in the additional
comments question at the end of the survey. Your responses
are completely anonymous.

Thanks and GOOD LUCK.

Article No. 77: posted by Dr. Jerrel Yates on Tue, May. 2, 2000, 20:31
Subject: Used Books/CDs

It is my understanding that the book store will not buy
back your ActivStats CD and Moores' Active Practice of
statistics.

If you wish to attempt to sell the bundle (no separates),
then email me with contact information and, optionally your
asking price. I will post this information on my web page
so that my students this summer can see the information.
However, that will be the complete extent of my
involvement.

Dr. Yates

Article No. 78: posted by Susan E Leigh on Tue, May. 16, 2000, 03:19
Subject: Study

I don't know if this woruld really apply in our class since
I've never done an online course before but if anyone would
like to get together to study for tests I would like to
know. I'll check back soon.

Article No. 79: [Branch from no. 78] posted by Leonardo A Malagon on Tue, May. 16, 2000,
19:14
Subject: re: Study

Hello, I'm up for a study group, I'd taken some statistics
before, so I'll be able to help a little. Please contact
me; salsero88@cs.com

Article No. 80: [Branch from no. 78] posted by Lisa D Hatcher on Wed, May. 17, 2000, 17:38
Subject: re: Study

I think a study group would be great. I am lost when it
comes to statistics. Contact me at grlracr72@aol.com

Article No. 82: [Branch from no. 80] posted by Christina L Green on Wed, May. 17, 2000, 23:39
Subject: re: Study

I am interested in a study group as well. I can be
contacted at glassine76@aol.com.

Article No. 84: [Branch from no. 78] posted by Michele D Moore on Thu, May. 18, 2000, 19:57
Subject: re: Study

Yes,

I would like to join to study group, after today I think I
could really use it. Contact me at DnBMoore@aol.com

Article No. 93: [Branch from no. 78] posted by W. C Bush on Tue, May. 23, 2000, 00:54
Subject: re: Study

I am also intrested in a study group. I can be cntacted at
LTBIJN@AOL.COM

Article No. 81: posted by Dr. Jerrel Yates on Wed, May. 17, 2000, 19:35
Subject: Data set WEN-3 (homework, lesson 3 ActivStats)

Question. Dr. Yates, this is Leonardo Malagon and I've been
unable to find the answer for questions 1 and 2, it makes
reference to WEN-3, I did look in the book, also in the
CD-ROM and I can't find it. Already got answers for
questions 3 and 4. Please send me info. Thanks for your
help. Leonardo.

Answer.

From lesson 3 of the ActivStats CD, click on the homework
icon (little blue house). Then scroll to find WEN-3.

Article No. 83: posted by Michele D Moore on Thu, May. 18, 2000, 19:52
Subject: Help on Lesson 4

I need help using the activstats CD on lesson MRA-4 I not
sure how to open the variables in order to run the data
analysis. Does anyone have any suggestions as to how I
can use the Disk more easily..

Article No. 86: [Branch from no. 83] posted by Dr. Jerrel Yates on Thu, May. 18, 2000, 20:44
Subject: re: Help on Lesson 4

Question: I need help using the activstats CD on lesson
MRA-4 I not sure how to open the variables in order to run
the data analysis. Does anyone have any suggestions as to
how I can use the Disk more easily..

Answer. Short hand notation. X=>Y=>Z is short hand
notation for click icon or menu item X, then click Y
(perhaps after scrolling), then click Z.

From ActivStats Lesson 4. HomeWork => MRA-4 => DataDesk
From DataDesk . Click on the Column Name name density in
the window named Earth density. The column now has a
yellow Y printed on it. Now: Plot => Histograms gives you
the histogram. Calc => Summaries => Reports gives you
mean, median, standard deviation, etc of the data set
marked with the Y.

Note. If the Y disappears from the data set, just click on
the data set again. For future reference, hold down the
control key while clicking to mark the data set with a Y.
Also, hold down the shift key while clicking to mark the
data set with a X. As in plotting X vs Y.

Article No. 87: [Branch from no. 86] posted by Michele D Moore on Thu, May. 18, 2000, 23:04
Subject: re: Help on Lesson 4

THANKS>>>>>>

DR. YATES...........

Denise Moore

Article No. 88: [Branch from no. 86] posted by DonnaA Cox on Mon, May. 22, 2000, 04:24
Subject: re: Help on Lesson 4

on quiz four, question two, I am coming up .2 or .1 short
of the correct answer every time, any suggestions also, I
am totally lost and way off on question 3 standard
deviation, I am using the s= formula in the book, what
mistakes could I be making thank you donna cox

Article No. 89: [Branch from no. 88] posted by Dr. Jerrel Yates on Mon, May. 22, 2000, 15:22
Subject: re: Help on Lesson 4

Question. In article 88 on Mon, May. 22, 2000, 04:24, DonnaA Cox writes:
>on quiz four, question two, I am coming up .2 or .1 short

>of the correct answer every time, any suggestions also, I

>am totally lost and way off on question 3 standard

>deviation, I am using the s= formula in the book, what

>mistakes could I be making thank you donna cox

Answer. In quiz 4, question 2 is about an average for two groups.
Group average = (Sum of all data values) / (number of data values).
But since you mention s, I assume you mean question 3.
I suspect your problem is rounding before completing all computations.

s2 = (S(y - ybar)2)/(n - 1)

Consider the data: 536, 567, 579, and 525

ybar = 551.75

y (y - 551.75)2

536 248.06025

567 232.5625

579 742.5625

525 715.5625

S(y - ybar)2)/(n - 1) = 1938.75/3
s2 = 646.25
s = 25.421448
Now Round to 25.4.

Article No. 90: [Branch from no. 88] posted by Dr. Jerrel Yates on Mon, May. 22, 2000, 16:36
Subject: re: Help on Lesson 4

Question. In article 88 on Mon, May. 22, 2000, 04:24, DonnaA Cox writes:
>on quiz four, question two, I am coming up .2 or .1 short

>of the correct answer every time, any suggestions also, I

>am totally lost and way off on question 3 standard

>deviation, I am using the s= formula in the book, what

>mistakes could I be making thank you donna cox

Answer. I did not read your question carefully enough.

One tenth under or over, could be a rounding problem.
Two tenths off probably is not a rounding problem.

Example.

`y1 = (Sy)/n1
`y2 = (Sy)/n2

Average of all the data = (n1 *`y1
+ n2 *`y2 )/(n1
+ n2 )

So, if first average is 72 and n1 = 25 and second average is
80 and n2 = 27 , then the group average = (25*72 +
27*80)/(25+27) = 76.1538. Rounding to the nearest tenth, we obtain 76.2

Since WebCT seems to be kludging my html in this response, see url:http://math.colstate.edu/jyates/Math1227Online/lectures/lesson4/groupedaverageexample.htm

Dr. Yates

Article No. 85: posted by Leonardo A Malagon on Thu, May. 18, 2000, 20:37
Subject: Lesson 3 quiz

Hi, I need help trying to get around questions 1 and 2. I
did tried all differents possibles ways but I'm going nuts.
Please somebody help. reach me: salsero88@cs.com

Article No. 91: posted by Aaron M Jollay on Mon, May. 22, 2000, 22:04
Subject: Test 1

i saw test 1 on our lesson quizes and exam menu. i was
under the impression that we had to come to arnold hall for
our tests. could someone please clarify?

Article No. 92: [Branch from no. 91] posted by Dr. Jerrel Yates on Tue, May. 23, 2000, 00:26
Subject: re: Test 1

It is password protected. You can not take it until I give
you the password. The password is changed immediately
after each test.

Dr. Yates

Article No. 94: posted by Dr. Jerrel Yates on Tue, May. 23, 2000, 03:18
Subject: Lesson Quiz 5

Question. Dr. Yates

Please advise me where I have gone made a mistake on this
problem?

The lifetime of a 2 volt non-rechargeable battery in
constant use has a normal distribution with a mean of 516
hours and standard deviation of 25 hours. What is the
approximate proportion of batteries with lifetimes between
520 and 539 hours? Compute your answer to at least 3
decimal places, your answer must be between 0 and 1.

P= area[ 520< X < 539] = area[ (520-516)/25 < Z <
(539-516)/25]

P=area[ .16 < Z < .92] = area[Z < .92] - P[Z < .16] =
.8212 - .5636 P= .2576 Your answer was .252

Answer.

Nicely worked out with all the steps. Your analysis and
answer is correct. My answer is wrong. I used regression
analysis to fit z scores to the area under the normal
curve. But my fit for this problem was only very good for
z > 1.45 or so. I used this fit find the area for the
upper z which was .92 in this problem and outside the
range of the fit. A no no. I have corrected this error. We
will learn about regression in lessons 7-9.

Thanks for responding.

Dr. Yates

Article No. 95: posted by Dr. Jerrel Yates on Tue, May. 23, 2000, 16:53
Subject: Blue Chat Room. Oops

I will be in the Blue Chat Room today at 1 PM. Yesterday,
I forgot. Those of you wishing to study together can use
any of the chat rooms anytime during the day. You just
have to be in the same chat room at the same time. Except
for 1 PM in the Blue Room, none of the chats have to
involve me.

I will try to be in Blue Room at 1 PM Mon.-Thur.

Dr. Yates

Article No. 101: [Branch from no. 95] posted by Dr. Jerrel Yates on Tue, May. 30, 2000, 14:31
Subject: re: Blue Chat Room. Oops

May 30th, 2000. Have a meeting at 1 PM today. Will not be
in the chat room today at 1 PM.

Dr. Yates

Article No. 96: posted by Susan E Leigh on Wed, May. 24, 2000, 02:58
Subject: Quiz #4, 2 and 3

I took quiz 4 and I missed questions 2 and 3 and don't
understand what I did wrong. I may have misread question 2
by adding 77+84/2 is this not the right way to do it. I
understood that 77 belonged to the first class and 84 the
second. The next question I did on the calculator, I added
524+360+340+606/4. I forgot a whole step didn't I? Susan

Article No. 97: [Branch from no. 96] posted by Dr. Jerrel Yates on Wed, May. 24, 2000, 03:54
Subject: re: Quiz #4, 2 and 3

Question. In article 96 on Wed, May. 24, 2000, 02:58,
Susan E Leigh writes:
>I took quiz 4 and I missed questions 2 and 3 and don't
>understand what I did wrong. I may have misread question 2
>by adding 77+84/2 is this not the right way to do it. I
>understood that 77 belonged to the first class and 84 the
>second. The next question I did on the calculator, I added
>524+360+340+606/4. I forgot a whole step didn't I? Susan

Answer. See the "Help on Lesson 4 Thread" messages 88-90.

Dr. Yates

Article No. 98: posted by Dr. Jerrel Yates on Wed, May. 24, 2000, 13:55
Subject: Math 1227 Test 1 Summer 2000

Test 1 is today, May 24th 4:45 - 7. Try to arrive by 6:15
PM. You will still be track if you take test 1 next
week and test 2 the following week (Wednesday, June 7th).

For each test:

1.You may write any information on a 3x5 card and use it
during a test.

2.You may use any calculator on a test. One which does two
variable statistics would be helpful but you can get by
with a calculator which does one variable statistics. A
graphics calculator is not required.

3. Bring several blank sheets of paper for scratch work.
Show all work for possible partial credit. Label each
problem, since no two tests are identical.

Taking the online test

1. Log onto WebCT and goto the lesson quizzes.

2. Your test will appear there along with the lesson
quizzes.

3. Every test is password protected. You will be given
the password at the time of the test.

4. Be sure to save each answer.

5. You may change an answer but be sure save your answer
after each change.

6. Once you begin the test, you will have 60 minutes to
complete the test.

7. Be sure to submit the test for grading once you have
completed the test.

8. When I notice that you have completed your test, it
will graded.

9. Your grade will be available immediately after grading
via "Check Grades" on the Math 1227 WebCT homepage.

10. Shut down your browser when finished. Otherwise,
anyone can all the information WebCT has stored for you
such as your grades and private mail. Log off the computer
before leaving.

Bona Fortuna,

Dr. Yates

Article No. 99: posted by Susan E Leigh on Sun, May. 28, 2000, 22:06
Subject: mean and standard diviation

I don't understand what I am doing wrong. I am figuring out
standard diviation and mean on a TI-83 calculator according
to the directions in its manual and I don't know why I come
out with the wrong answers on quiz 4 questions 2 and 3. The
previous threads did not supply the information I needed.
Susan

Article No. 100: [Branch from no. 99] posted by Dr. Jerrel Yates on Mon, May. 29, 2000, 03:48
Subject: re: mean and standard diviation

Question. In article 99 on Sun, May. 28, 2000, 22:06,
Susan E Leigh writes:
>I don't understand what I am doing wrong. I am figuring out
>standard diviation and mean on a TI-83 calculator according
>to the directions in its manual and I don't know why I come
>out with the wrong answers on quiz 4 questions 2 and 3. The
>previous threads did not supply the information I needed.
>Susan

Answer.

You computed the standard deviation correctly on your
second attempt. However, I don't think that the TI-83
handles group averages.

See Article No. 90 in the thread Help on lesson quiz 4 for
help on the group average. You will see how to compute the
group average correctly after reading the example at URL:
http://math.colstate.edu/jyates/Math1227Online/lectures/lesson4/groupedaverageexample.htm

If this does't help, post again showing your work (as much
as you can).

Dr. Yates

Article No. 102: posted by Katie M Bentley on Tue, May. 30, 2000, 16:53
Subject: lesson 8

i do not understand the correllation equation on page 85.
is there any other way to calculate correlation or is this
formula the only way. i do not understand the formula.
can you explain in better terms than the book does.
thanks, katie bentley

Article No. 103: [Branch from no. 102] posted by Dr. Jerrel Yates on Tue, May. 30, 2000, 19:08
Subject: re: lesson 8

Question. In article 102 on Tue, May. 30, 2000, 16:53,
Katie M Bentley writes:
>i do not understand the correllation equation on page 85.
>is there any other way to calculate correlation or is this
>formula the only way. i do not understand the formula.
>can you explain in better terms than the book does.
>thanks, katie bentley

Answer.

The easiest way to compute r is to use software or have a
calculator which will compute r.

I have an example worked out using the text's formula and
an example worked out using an equivalent alternate
formula. The alternate formula is easier to use if you are
using a calculator (like on test). For the examples see
my web site:
http://math.colstate.edu/jyates/Math1227Online/lectures/lesson8/correlation.htm

Neither formula is very intuitive. But it does measure the
strength the linear relationship between two quantative
variables (r).

If those examples don't allow you to compute r, post here
again and show how much of the computation you were able
to complete.

Dr. Yates

Article No. 104: posted by Susan E Leigh on Wed, May. 31, 2000, 14:17
Subject: lesson quiz 5

i'm confused on lesson 5. A few questions want to know the
area under normal curve for Z< a given number. In the book
they show it with an = not < or > this throws me. Am I
missing something obvious? I'd hate to come take the test
and not pass it because of this.

Article No. 105: [Branch from no. 104] posted by Dr. Jerrel Yates on Wed, May. 31, 2000, 14:46
Subject: re: lesson quiz 5

Question. In article 104 on Wed, May. 31, 2000, 14:17,
Susan E Leigh writes:
>i'm confused on lesson 5. A few questions want to know the
>area under normal curve for Z< a given number. In the book
>they show it with an = not < or > this throws me. Am I
>missing something obvious? I'd hate to come take the test
>and not pass it because of this.

Answer. Consider z = 1.1. The area under the normal curve
to the left of z = 1.1 is the same as the area under the
normal curve for Z < 1.1. To shade this area you would
shade all the area for Z < 1.1. Some authors also write
this as Area(Z < 1.1) or Pr(Z < 1.1). From the table this
area is 0.8643

The area under the normal curve to the right of z = 1.1 is
the same as the area under the normal curve for Z > 1.1.

Due to the symmetry of the normal curve, Area(Z > 1.1) =
Area(Z < -1.1). Ie, area in upper tail is equal to area in
the lower tail. From the table Area(Z < -1.1) = 0.1357.

We can check our work. All the area under the normal curve
= 1. The area to the left of z = 1.1 plus the area to the
right of z = 1.1 is all the area under the normal curve.
So, Area(Z < 1.1) + Area(Z > 1.1) = 1. Or, Area(Z > 1.1)
= 1 - Area(Z < 1.1) = 1 - 0.8643 = 0.1357.

Dr. Yates

Article No. 106: posted by Dr. Jerrel Yates on Sun, Jun. 4, 2000, 19:08
Subject: On Campus Office Hour

I will be on campus Monday, June 5, at 1 PM, Faculty Office
Building, Rm 220.

Will stay until there are no more questions otherwise will
stay until 1:30 PM. Any questions you may have on Lessons
2-13 and 15-21 are welcomed.

Dr. Yates

Article No. 107: posted by Dr. Jerrel Yates on Thu, Jun. 8, 2000, 16:12
Subject: Office Hrs, Schedule, Orientation

The schedule of most mathematics faculty members changed
including mine. My campus office hours will be from 11-12
Monday, Tuesday and Thursday.

Since no new students enrolled for this class during the
regular summer registration, the orientation
scheduled for June 8th is will not be held. If this
presents a problem, please contact me.

Dr. Yates

Article No. 108: posted by Dr. Jerrel Yates on Thu, Jun. 8, 2000, 17:09
Subject: Staying on Track

If you have not taken test 1 you, are behind. You should
have tests 1 and 2 completed by June 14th. To determine
whether you are behind, look at the calendar. If you have
not taken a test by the last date it is mentioned in the
calendar, you are behind. For example, the last date test
2 appears in the calendar is June 14th. The last time test
3 appears in the calendar is June 28th.

Dr. Yates

Article No. 109: posted by Dr. Jerrel Yates on Fri, Jun. 9, 2000, 03:55
Subject: Out of Town June 9-11

I will be out of town June 9-11.

Dr. Yates

Article No. 110: posted by Dr. Jerrel Yates on Sun, Jun. 11, 2000, 21:06
Subject: Blue Chat Room

Starting June 13th, the chat room will be monitored from
11:00 AM to Noon. Will also try to run the chat room in
the background whenever I am on the computer. Just check
and see if I am logged in.

Dr. Yates

Article No. 111: posted by Dr. Jerrel Yates on Sun, Jun. 18, 2000, 17:59
Subject: Test 5

Test 5 covers lessons 19-20. In addition to problems like
those in Lesson Quizzes 19A-C and 20, be able to compute

A. The standard deviation of a sampling distribution. B.
Compute the z-score for a given test statistic.

See my examples for lesson 19 in my lecture notes:
http://math.colstate.edu/jyates/Math1227Online/lectures/lesson19/hypothesistesting.htm

In each example, I first compute the standard deviation of
the sampling distribution = s`x, then I compute the z-score
for the test statistic z = (`x - m`x)/s`x

Problems of the above types are added to test 5 because you
must be able to perform those computations inorder to
compute the p-value for a test statisic.

Dr. Yates

Article No. 112: posted by Joseph A Dudzik on Mon, Jun. 19, 2000, 05:14
Subject: which lessons match your 5 exams

I would like to know which lessons I need to be prepared
for which tests. ie: for test 3 will I only need to study
lessons 10 & 11? etc.???

Article No. 113: [Branch from no. 112] posted by Dr. Jerrel Yates on Mon, Jun. 19, 2000, 16:16
Subject: re: which lessons match your 5 exams

See
URL:http://math.colstate.edu/jyates/Math1227Online/schedule.htm
for a good copy.

The contents have been copied below (and garbled by WebCT).

Dr. Yates

Schedule

Note: See your WebCT calendar for
specific times and dates for tests. Lesson
quizzes may be taken anytime, but should be completed
before you are tested on the material. The schedule
below is for students completing the course during the
period from May 15th to July 25th. If you wish to
complete the course in three or six weeks, then an
acceleration is necessary.

May
15 -- Week 1. Orientation and Lessons 2-4

May 22 -- Week 2. Lessons 5

May 29 -- Week 3. Lessons 6
and 7

Jun 5 -- Week
4. Lessons 8 and 9

Jun 12
-- Week 5. Lesson 10-13

Jun 19 -- Week 6. Lessons
15-16

Jun 26 -- Week 7. Lessons
17-18

Jul 3 -- Week
8. Lessons 19

Jul 10 -- Week
9. Lesson 20

Jul 17 -- Week 10.
Lesson 21

Test
Schedule

The test
schedule will be liberal for this summer. Tests will
be given each Wednesday, 5-7 PM, Arnold 201, starting May
24th. If there are conflicts, an alternate time will
be selected. You should take the test as soon as you finish
the corresponding lessons and lesson quizzes. Those
wishing to complete this course during the maymester will
have to complete two tests per week plus the final
exam. Those wishing to complete the class during the
regular summer session will have to complete a test each
week. Everybody else must complete the course by July
26th.

Test 1.
Lessons 2-5.
Test 2. Lesson 6-9

Test 3. Lessons 10-13 and 15-16

Test 4. Lessons 17-18
Test 5.
Lessons 19-20
Final Exam Lessons 2-13 and
17-21.

Article No. 115: posted by Teresa L Gibbo on Wed, Jul. 5, 2000, 23:53
Subject: Quiz question

I do not know how to find the answer to this problem: In a
large population of adults, the mean IQ is 112 with a
standard deviation of 20. Suppose 200 adults are randomly
selected for a market research campaign. What is the
probability that the sample mean IQ is graeater than 110?

Article No. 116: [Branch from no. 115] posted by Dr. Jerrel Yates on Thu, Jul. 6, 2000, 04:36
Subject: re: Quiz question

In article 115 on Wed, Jul. 5, 2000, 23:53, Teresa L Gibbo
writes:
>I do not know how to find the answer to this problem: In a
>large population of adults, the mean IQ is 112 with a
>standard deviation of 20. Suppose 200 adults are randomly
>selected for a market research campaign. What is the
>probability that the sample mean IQ is graeater than 110?
>
>
You may find the solution at URL:
http://math.colstate.edu/jyates/Math1227Online/lectures/lesson16/questions/lesson16questions.htm

Dr. Yates

Article No. 117: posted by DonnaA Cox on Tue, Jul. 11, 2000, 02:55
Subject: HHHEEEEEELLLLLPPPPP!!!

Dr. Yates, Katie and I are doing lesson quiz 19 A. We are
using your lecture notes and the formula for computation of
the P-value. We got several right using this formula.
However, we missed about half. We used the EXACT same
procedure for ALL of the problems. Is there something we
need to do different. Please help soon, we ahve been on
the same quiz for three days. Thank you Donna and Katie

Article No. 118: [Branch from no. 117] posted by Dr. Jerrel Yates on Tue, Jul. 11, 2000, 04:09
Subject: re: HHHEEEEEELLLLLPPPPP!!!

In article 117 on Tue, Jul. 11, 2000, 02:55, DonnaA Cox
writes:
>Dr. Yates, Katie and I are doing lesson quiz 19 A. We are
>using your lecture notes and the formula for computation of
>the P-value. We got several right using this formula.
>However, we missed about half. We used the EXACT same
>procedure for ALL of the problems. Is there something we
>need to do different. Please help soon, we ahve been on
>the same quiz for three days. Thank you Donna and Katie

Answer. For question 4, you got the area for the lower
tail(Cox, attempt 2), but you forgot to double the value
to the the p-value. For not equal, compute the area in one
tail, then double it to get the area in both tails.

Question 4 (9 marks)

A very large high school wishes to know how it compares to
the national average on the SAT Math. The national average
is m = 600, the population standard deviation is s = 108.
They believe that their students average is different from
the national average. A SRS of 27 students is chosen and
their average on the SAT Math is found to be 558. The null
and alternative hypothesis are: H0: m = 600 Ha: m not equal
to 600

Calculate the P-value for this test. Round your answer to
the nearest thousandth. Answer should be between 0 and 1.
Note: WebCT answer may be off by a few thousandths but the
tolerance is set to handle those discrepancies.

Student Response: .022 Correct Answer: 0.043

===========================================================
For your question 5 (Cox, attempt 2), you should have
gotten the area in the upper tail, then double it. You got
the area z < .31 which is .6217 but needed the area in the
upper tail which is 1 - .6217 = .3783. Now double this
since the alternative hypothisis is not equal and get
0.7566.

Question 5 (9 marks)

A very large schoool system wishes to know how it compares
to the national average on the SAT Math. The national
average is m = 600, the population standard deviation is s
= 114. They believe that their students average is
different from the national average. A SRS of 27 students
is chosen and their average on the SAT Math is found to be
607. The null and alternative hypothesis are: H0: m = 600
Ha: m not equal 600

Calculate the P-value for this test. Round your answer to
the nearest thousandth. Answer should be between 0 and 1.
Note: WebCT answer may be off by a few thousandths but the
tolerance is set to handle those discrepancies.

Student Response: .626 Correct Answer: 0.750

===========================================================

Hope this helps,

Dr. Yates

Article No. 119: posted by Dr. Jerrel Yates on Mon, Jul. 24, 2000, 16:26
Subject: Reminder Final Exam

The final is scheduled for this Wednesday, July 26th. I
will try to have Arnold 201 open by 4 PM. The exam is two
hours and covers all the lessons from the previous exams
plus lesson 21.

Enjoyed working with you this summer. Good luck,

Dr. Yates

Message no. 1: posted by Dr. Jerrel Yates (math1227a) on Tue Aug 29, 2000 03:52
Subject: Lesson Quizzes

Lesson Quizzes may be taken anytime and anywhere an
Internet connection is available.  There are no published
due dates for the lesson quizzes, but to stay on schedule
follow the recommended course schedule:
http://math.colstate.edu/jyates/Math1227Online/schedule_fall_2000.htm

To see which lesson quizzes should be completed before each
test is taken, see the testing schedule: 
http://math.colstate.edu/jyates/Math1227Online/schedule_fall_2000.htm

Dr. Yates

Message no. 2: posted by Dr. Jerrel Yates (math1227a) on Tue Aug 29, 2000 03:57
Subject: Testing Dates-Online Class

Tests may be taken each Tuesday, Arnold 201, starting
September 5th as soon as you are prepared to take them. 
This should allow you a little more flexibility.

Dr. Yates

Message no. 3: posted by Dr. Jerrel Yates (math1227a) on Wed Aug 30, 2000 04:38
Subject: Lesson Quiz 3 Data for Lecture Class

Subject: quiz 3 

i do not understand the fisrt question for quiz 3.  what
data set? where?  if you could point me in the right
direction i would be most grateful.

Chris Baugh

Thanks for the question.  The data for this 
question and the next is given below.  The data
represents the lengths of stay of American tourists
in Europe.  You may copy the data below and paste
it into Minitab.

Dr. Yates

41
16
6
21
1
21
5
31
20
27
17
10
3
32
2
48
8
12
21
44
1
56
5
12
3
13
15
10
18
3
1
11
14
12
64
10

Message no. 4: posted by Dr. Jerrel Yates (math1227a) on Tue Sep 05, 2000 04:03
Subject: Test 1 Online Class

Arnold 201 5-7 PM.

First opportunity to take Test 1 on Lessons 2-5.  Complete
lesson quizzes 2-5 before taking test 1 and your score on
test 1 should be better.

Dr. Yates

Message no. 5: [Branch from no. 4] posted by Dr. Jerrel Yates (math1227a) on Tue Sep 05, 2000 04:07
Subject: re: Test 1 Online Class

PS:  September 5, 2000

Message no. 6: [Branch from no. 5] posted by Kristen Daniels (daniels_kristen) on Wed Sep 06, 2000 19:55
Subject: re: Test 1 Online Class

Dr. Yates, are the alternating Tuesdays still in effect?
You recently sent an email that said we could take a test
every Tuesday if we wanted, which allowed more
flexibility...however in your course information it said
Sept. 5th and 19th...I'm a little unsure on this subject..

Kristen Daniels

Message no. 7: [Branch from no. 6] posted by Dr. Jerrel Yates (math1227a) on Thu Sep 07, 2000 16:40
Subject: re: Test 1 Online Class

Ms. Daniels,

Yes you may take any test on any Tuesday 5- 7 PM Arnold 201
(non holidays). I moved the testing for my Internet
Precalculus from alternate Thursdays to Tuesdays.  It
seemed that this would give both classes more flexible
schedules for testing.

Dr. Yates

Message no. 11: posted by Dr. Jerrel Yates (math1227a) on Mon Oct 02, 2000 02:59
Subject: Staying on Track

You should be taking test 2 October 3rd and no later than
October 17th (October 10th is a holiday).

If you take test 1 October 2nd you are at least two weeks
behind.  Try to catch up. If you are getting stuck, come by
and see me or visit our CSU math tutors. For a tutoring
schedule see
http://math.colstate.edu/deparmentinfo/tutoring.html


Dr. Yates

Message no. 12: [Branch from no. 11] posted by Dr. Jerrel Yates (math1227a) on Mon Oct 02, 2000 15:55
Subject: re: Staying on Track

P.S.  This obviously applies to the Online Statistics class
only.

Message no. 16: [Branch from no. 12] posted by Siobhan Jones (jones_siobhan) on Thu Oct 19, 2000 15:31
Subject: re: Staying on Track

Dr. Yates,

I emailed you on Tuesday to inform you that I had come to
take my test at 4:00, but no one ever showed up. I stayed
until 4:30 just in case you would be late. I was there to
take Test 2. If it is okay for me to take it some other
time please let me know. my email address at home is
tazjones@msn.com.

Thanks

Message no. 17: [Branch from no. 16] posted by Dr. Jerrel Yates (math1227a) on Thu Oct 19, 2000 16:31
Subject: re: Staying on Track

Ms. Jones,

Check your email and see if that message bounced.  I
searched my email folders and there was no email received
from a Jones on Oct. 17th.  Testing times are from 5-7 PM
each Tuesday except for holidays.  You must get a
confirmation from me before you show up a different time. 

I usually arrive about 4:45 about 15 minutes early each
Tuesday.

Dr. Yates

Message no. 18: [Branch from no. 17] posted by Siobhan Jones (jones_siobhan) on Fri Oct 20, 2000 01:47
Subject: re: Staying on Track

Dr. Yates,

Thanks for that verification of the times. Is it Okay for
me to take the test on next tuesday?

Siobhan Jones

Message no. 19: [Branch from no. 18] posted by Dr. Jerrel Yates (math1227a) on Sat Oct 21, 2000 03:15
Subject: re: Staying on Track

Ms. Jones,

I will be there every Tue. 5-7, Arnold 201 until Dec 12th
except for Holidays.  I will be there Dec 12 4-7 PM.

Dr. Yates

Message no. 13: posted by Dr. Jerrel Yates (math1227a) on Thu Oct 12, 2000 17:00
Subject: Test 3

Test 3 covers Lessons 10-16 (omit 14) from Moore's Active
Practice of statistics.  The same material is found in
chapters 3 and 4 of Moore's Basic Practice of Statistics.

You should complete Lessons 10-11 quiz, Lessons 12-13 quiz
and Lessons 15-16 quiz before taking Test 3.

There are proportion problems on the lesson quizzes. 
However, you will be given the mean and standard deviation
for any proportion problem on Test 3.

If you have questions on this material, please post them
here.  You also may come to my lecture class 1-2:15 MW.

Dr. Yates

Message no. 15: posted by Dr. Jerrel Yates (math1227a) on Fri Oct 13, 2000 18:05
Subject: Correlation Question - Lesson 8

Question. I am still unclear about what the greek looking e
is.  How do you compute this? Is is all the values added
together?  Also, aside from not understanding the greek e,
I don't understand what all the variables are in the
correlation formula.  Can you possibly give me an easier
example with smaller numbers to compute?

Answer.

The greek letter capital sigma is the symbol for summation,
i.e., add them all up. If expressions appear in the sum
such as xy, it means for any  x multiply by the
corresponding data value y, then add all the products
together. Recall that you must view the data for
correlation as data pairs (x, y).  The variable x is used
for the explanatory variable.  The variable y is used for
the response variable.  

There is new example on the Math 1127 online site.  Go to 
http://math.colstate.edu/jyates/Math1127Online/lectures/lesson8/correlation.htm
 and scroll down to the text: An example using the
alternate formula and a smaller data set, n = 4

Dr. Yates

Message no. 20: posted by Kristen Daniels (daniels_kristen) on Mon Nov 06, 2000 21:12
Subject: Help :)

Hi Dr Yates, Im having a bit of trouble with Lessons 15-16
quiz...would you be able to give me some insight on how to
solve this problem?

The problem reads as: An unfair coin has a 40%% chance of
coming up head when tossed.  This coin is tossed 900 times.
 What is the chance that the sample proportion of heads
will obtain between .40 and .42? Express your answer
between 0 and 1.  Enter your answer to two decimal places. 

Thanks Kristen Daniels Online Statistics

Message no. 21: posted by Kristen Daniels (daniels_kristen) on Mon Nov 06, 2000 21:52
Subject: One more

As I was going through the quiz over and over, I realized
that there was one more than I was unsure about on Lessons
15-16...the problem reads as this:

The distribution of actual weights of 8 oz. chocolate bars
produced by a certain machine is normal with mean 8.1
ounces and standard deviation 0.1 ounces.  A sample of 5 of
these chocolate bars is selected. The probability that
their average weight is less than 8 oz. is what?

I started the process ( of what I think I should do) and I
figured that we use the formula for the standard deviation
of the sampling distribution and the unknown would be p,
since we know the value of standard deviation and n being
equal to 5 in this case .Am I on the right track?

Message no. 23: [Branch from no. 21] posted by Dr. Jerrel Yates (math1227a) on Mon Nov 06, 2000 23:57
Subject: re: One more

Ms. Daniels,

This is a central limit theorem problem.  The standard
deviation of the sampling distribution is sigma/sqrt(n),
where sigma is the population standard deviation and n is
the sample size.

See the Central Limit Theorem at:

http://math.colstate.edu/jyates/Math1127Online/lectures/lesson16/samplingdistributions.htm

For examples, see my web site:

http://math.colstate.edu/jyates/Math1127Online/lectures/lesson16/CLTexamples.htm

Dr. Yates

Message no. 24: posted by Dr. Jerrel Yates (math1227a) on Tue Nov 07, 2000 00:06
Subject: Lecture Class Test 4

Lecture Class.  Test 4 covering confidence intervals
(Chapters 6 & 7 just the part on confidence intervals) will
be Wednesday, November 8, 2000.  This corresponds to WebCT
Lessons 17 & 18.

Dr. Yates

Message no. 26: posted by Dr. Jerrel Yates (math1227a) on Tue Nov 28, 2000 04:26
Subject: Lecture Class Test 5

Lecture Class Test 5:  Monday, December 4th, 1-2:15 PM,
Arnold 201.

Covers the hypothesis testing from Chapter 6 and Section 1
of Chapter 7.

You should complete lesson quizzes 19 and 20 before taking
test 5.

Dr. Yates

Message no. 27: posted by Kristen Daniels (daniels_kristen) on Mon Dec 04, 2000 22:52
Subject: Test 5

Dr. Yates, I was just wanting to double check that Test 5
in your Online class would only cover lessons 19-20 and
that lesson 21 would be included in the final..did I read
that right in your syllabus?

Kristen Daniels

Message no. 28: [Branch from no. 27] posted by Dr. Jerrel Yates (math1227a) on Tue Dec 05, 2000 03:31
Subject: re: Test 5

Ms. Daniels,

Yes, you read that correctly for the online final.

Dr. Yates

Message no. 29: posted by Dr. Jerrel Yates (math1227a) on Fri Dec 08, 2000 16:23
Subject: Final Average Online/Lecture

Final Average Online/Lecture

When you check your grades on WebCT, the Final Average is
the points you have accumulated so far in the course. I.e.,
if you make zeros on the rest of your tests and lesson 
quizzes, that would be your final average.

Lecture class students can pickup as many as an additional
13.3 points on the final.  Online class students can pickup
as many as an additional 15 points on the final. To get the
maximum, you would need to score 100 on the final. You will
pick up more points if your score on the final is higher
than your lowest test score.

Your last date to complete lesson quizzes will be Noon,
December 18th.  Some of you have not completed many of the
lesson quizzes and this will adversely impact on your final
grade.

Good Luck,

Dr. Yates

Message no. 30: posted by Lisa Hatcher (hatcher_lisa) on Tue Dec 12, 2000 16:34
Subject: quiz grade?

I think web ct made an error in grading the last question
on lesson 5 quiz.  Could you check it out for me?          
                         Thanks,                           
            Lisa Hatcher

Message no. 31: [Branch from no. 30] posted by Dr. Jerrel Yates (math1227a) on Fri Dec 15, 2000 16:07
Subject: re: quiz grade?

Will do.

Dr. Yates

Message no. 32: posted by Dr. Jerrel Yates (math1227a) on Tue Jan 02, 2001 18:24
Subject: Math 1127 Test Message WebCT 3.1

Welcome to Math 1127 Into statistics.

Message no. 33: posted by Dr. Jerrel Yates (math1227a) on Fri Jan 12, 2001 21:30
Subject: Welcome

Welcome to Math 1127 Lecture class and Math 1127 Online class. Feel free to post your course related questions here. Dr. Yates

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