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A study of the ages of motorcyclists killed in crashes involves the random selection of 168 drivers with a mean of 35

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A study of the ages of motorcyclists killed in crashes involves the

random selection of 168 drivers with a mean of 35.37 years. Assuming that σ=11.8 ?years, construct and interpret a 90?% confidence interval estimate of the mean age of all motorcyclists killed in crashes.


What is the 90?% confidence interval for the population mean μ??






<μ<




?(Round to two decimal places as? needed.)