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A study of the ages of motorcyclists killed in crashes involves the random selection of 167drivers with a mean of 3 1 . 5 5

A study of the ages of motorcyclists killed in crashes involves the random selection of 167drivers with a mean of 31.55years. Assuming that =11.7 years, construct and interpret a 95% confidence interval estimate of the mean age of all motorcyclists killed in crashes.

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