A test on car braking reaction times for men between 18 and 30 years old have a produced a mean and standard deviation of 0.610 sec and 0.123 sec, respectively. When 40 male drivers of this group were randomly selected and tested for their breaking reaction times, a mean of 0.587 second came out. At the a = 0.01 level of significance, test the claim of the driving instructor that his graduates had faster reaction times.

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