Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 13, Problem 76H
A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt working-class
people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and
asked them their daily one-way commuting mileage. The results are as follows.
| working-class | professional (middle incomes) | professional (wealthy) |
| 17.8 | 16.5 | 8.5 |
| 26.7 | 17.4 | 6.3 |
| 49.4 | 22.0 | 4.6 |
| 9.4 | 7.4 | 12.6 |
| 65.4 | 9.4 | 11.0 |
| 47.1 | 2.1 | 28.6 |
| 19.5 | 6.4 | 15.4 |
| 51.2 | 13.9 | 9.3 |
Table 13.32
Determine whether or not the variance in mileage driven is statistically the same among the working class and professional
(middle income) groups. Use a 5% significance level.
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Chapter 13 Solutions
Introductory Statistics
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