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Stat 133 HW 8 (10 pts)
Name___________________ Group # _____
Please read and follow the information in the “Homework Policies” document posted in the
Homework section of Carmen. Make HW an opportunity to learn and prepare for the final.
Reminder: Copying or nearly copying HW can and already has resulted in a loss of a full letter
grade in the class this quarter, as determined by the OSU Committee on Academic Misconduct.
Hand drawn/written work is fine as long as it is legible. Please don’t add extra space in the
document.
NORMAL DISTRIBUTION
1.
Do problem 1.86 on page 49 of your textbook. Please note that “standardized scores” are also
known as Zvalues, or “Zscores”. Draw the appropriate pictures of the normal distributions,
show all work and justify your answer in less than 10 words.
so Z=(680500)/100=1.8
200 300 400 500 600 700 800
0
6
12
18
24
30
36
So Z=(2718)/6=1.5
So Eleanor’s standardized score is higher than Gerald’s, he did better in the exam.
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View Full Document2.
Do problem 1.106 on page 62 of your textbook.
Use the “TELECOMSTOCKS” data posted on Carmen in the HW section. The point of the
problem is to see if the 689599.7 rule works for the DATA in this case. That helps you to decide
whether the POPULATION has a normal distribution. You’ll do the calculations using the mean
and standard deviation of the DATA (and s), instead of the mean and standard deviation of the
POPULATION (
μ
and
σ
), which are not available.
a.
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 Fall '07
 rumseyjohnson

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