Introduction to Probability and Statistics
14th Edition
ISBN: 9781133103752
Author: Mendenhall, William
Publisher: Cengage Learning
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Chapter 1, Problem 1.49SE
(a)
To determine
To find out if there will be a trend in the winning times over the years and to draw a line chart to verify the answer.
(b)
To determine
To describe the distribution of winning times using an appropriate graph and to comment on the shape of the distribution and look for any unusual observations.
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A market research firm used a sample of individuals to rate the purchase potential of a particular product before and after the individuals saw a new television commercial about the product. The purchase potential ratings were based on a 0 to 10 scale, with higher values indicating a higher purchase potential. The null hypothesis stated that the mean rating "after" would be less than or equal to the mean rating "before." Rejection of this hypothesis would show that the commercial improved the mean purchase potential rating. Use = .05 and the following data to test the hypothesis and comment on the value of the commercial.
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After
Before
Individual
After
Before
1
6
5
5
3
5
2
6
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3
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Chapter 1 Solutions
Introduction to Probability and Statistics
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