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A study conducted to examine the age of commercial jets in the United States sampled 36 planes and found the average age to be 12.6

A study conducted to examine the age of commercial jets in the United States sampled 36 planes and found the average age to be 12.6 years with a standard deviation of 2.7.

(a) Calculate and interpret a 90% confidence interval for the average age of commercial jets in the United States.

(b) A report in USA Today claimed that the mean age of commercial jets in the United States was 14 years. Using the confidence interval in (a), is there enough evidence to refute this claim?

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