A number of minor automobile accidents occur at various high-risk intersections in Jackson despite traffic lights....

A number of minor automobile accidents occur at various high-risk intersections in Jackson despite traffic lights. The police department claims that a modification in the type of lights will reduce these accidents. The city commissioners have agreed to a proposed improvement experiment. Eight intersections were chosen at random and the lights at those intersections were modified. The number of minor accidents during a six months period before and after the modifications were:

Number of Accidents

A B C D E F G H

Before Modification 5 7 6 4 8 9 8 10

After Modification 3 7 7 0 4 6 8 2

At the .05 significance level is it reasonable to conclude that the modification made any difference in the number of traffic accidents? Must use the five steps Test Hypothesis.

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orchestra answered 1 year ago

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