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

N UMBER 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

1. Why might the Mann-Whitney U test be preferred to the t test for these data?
2. Use U to test the null hypothesis at the .05 level of significance.
3. Specify the approximate p -value for this test result.

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