Introductory Statistics
3rd Edition
ISBN: 9780135188927
Author: Gould, Robert, Ryan, Colleen N. (colleen Nooter)
Publisher: Pearson,
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Textbook Question
Chapter 3, Problem 25SE
Drinkers The number of alcoholic drinks per week is given for adult men and women who drink. The data are at this text’s website. (Source: Alcohol data from adults survey results, accessed via StatCrunch. Owner: rosesege)
a. Compare the
b. Compare the standard deviation of the number of drinks of men and of women.
c. Remove the outliers of 70 and 48 drinks for the men, and compare the means again. What effect did removing the outliers have on the mean?
d. What effect do you think removing the two outliers would have on the standard deviation, and why?
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The U.S. Postal Service will ship a Priority Mail® Large Flat Rate Box (12" 3 12" 3 5½") any
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domly chosen boxes are shown below. (a) Make a stem-and-leaf diagram. (b) Make a histogram.
(c) Describe the shape of the distribution. Weights
72 86 28 67 64 65 45 86 31 32
39 92 90 91 84 62 80 74 63 86
(a) What is a bimodal histogram? (b) Explain the difference between left-skewed, symmetric, and right-skewed histograms. (c) What is an outlier
(a) Test the hypothesis.
Consider the hypothesis test Ho
=
:
against H₁o < 02. Suppose that the sample sizes aren₁ =
7 and n₂
= 13 and that
$²
= 22.4 and $22
= 28.2. Use α = 0.05.
Ho
is not
✓ rejected.
9-9
IV
(b) Find a 95% confidence interval on of 102. Round your answer to two decimal places (e.g. 98.76).
Chapter 3 Solutions
Introductory Statistics
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