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    Auto Accident Statistics

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    A number of minor automobile accidents occur at various high-risk intersections. A study was done. Eight intersections were chosen at random. The number of minor accidents during a 6-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 0.01 significance level is it reasonable to conclude that the modification reduced the number of traffic accidents?

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    https://brainmass.com/statistics/hypothesis-testing/58250

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