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.