Chapter 13, Problem 65H

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 in Table 13.22. Using a 5% significance level, test

the hypothesis that the three mean commuting mileages are the same.

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 13.22