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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