Question: The average local cell phone call length was reported to be 3.55 minutes. A random sample of22 phone calls showed an average of 3.75 minutes

The average local cell phone call length was reported to be 3.55 minutes.

A random sample of22 phone calls showed an average of 3.75 minutes in length with a standard deviation of 0.71.

At a = 0.05, can it be concluded that the average local cell phone call length is more than the population average?

Assume that the population is approximately normally distributed.

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