i sixsigma
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A study of the ages of motorcyclists killed in crashes involves the random selection of 149 drivers with a mean of 38.68 years. Assuming that sigma = 10.6
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 mu?
Notice that the confidence interval limits do not include ages below 20 years. What does this mean?
