Question: Two methods for controlling traffic, A and B, were used at each of n 12 intersections for a period of 1 week, and the numbers

Two methods for controlling traffic, A and B, were used at each of n 12 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 selected in a random manner. 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.

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

Method AB Method Intersection Intersection A B 10 12

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