Question: A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents.  The county commissioners have agreed to a proposed experiment.  Eight intersections were chosen at random and the lights at those intersections were modified.  The numbers of minor accidents during a six-month 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 .01 significance level is it reasonable to conclude that the modification reduced the number of traffic accidents?

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