A group of high-risk automobile drivers (with three moving violations in one year) are required,

A group of high-risk automobile drivers (with three moving violations in one year) are required, according to random assignment, either to attend a traffi c school or to perform supervised volunteer work. During the sub-sequent fi ve-year period, these same drivers were cited for the following number of moving violations:

NUMBER OF MOVING VIOLATIONS

TRAFFIC SCHOOL VOLUNTEER WORK

0                                  26

0                                   7

15                                  4

9                                    1

7                                     1

0                                   14

2                                    6

23                                 10

7                                    8

(a) Why might the Mann-Whitney U test be preferred to the t test for these data?

(b) Use U to test the null hypothesis at the .05 level of signifi cance.

(c) Specify the approximate p -value for this test result.

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