Construct confidence interval: randomly-selected cars have mean age of 7.4 years

megarust

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[h=1]Randomly selected 25 student cars have ages with a mean of 7.4 years and a standard deviation of 3.4 years, while randomly selected 15 faculty cars have ages with a mean of 5.2 years and a standard deviation of 3.3 years.
Construct a 99% confidence interval estimate of the difference μs−μf, where μs is the mean age of student cars and μf is the mean age of faculty cars.[/h]
 
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