Question: 13. Traffic Control Two methods for controlling traffic, A and B, were used at each of n512 intersections for a period of 1 week, and

13. Traffic Control Two methods for controlling traffic, A and B, were used at each of n512 intersections for a period of 1 week, and the numbers of accidents that occurred during this time period were recorded. The order of use (which method would be employed for the first week) was randomly selected.

You want to know whether the data provide sufficient evidence to indicate a difference in the distributions of accident rates for traffic control methods A and B.

B 7 2 3 8 4 1 Method Intersection _A A B

a. Analyze using a sign test.

b. Analyze using the Wilcoxon signed-rank test for a paired experiment.

B 7 2 3 8 4 1 Method Intersection _A A B Method Intersection A 9 10 3 11 12 4492MO 6 1 0 56836- 123456 925T 7561 1

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