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A report states that the average age of commercial airliners in the United States is 11 years with a standard deviation of2.7 years.A researcher wants

A report states that the average age of commercial airliners in the United States is 11 years with a standard deviation of2.7 years.A researcher wants to test this claim and finds that a random sample of40 planesfrom around the United States has an average age of12.2years.At an= 0.05,

can you conclude that the average age of airliners has increased?

(a)

What is the test statistic for this scenario? (Round your answer to two decimal places.

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