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