Suppose a Phone Company Reports That the Average Duration of a Cell

Short Answer

Suppose a phone company reports that the average duration of a cell phone call is 1.7 minutes with a standard deviation of 1.4 minutes.
-If you examine a random sample of 60 of your cell phone calls and find that the sample mean duration is 2.0 minutes, would it be reasonable to conclude that the average duration in the population of all your cell phone calls is greater than 1.7 minutes? Explain, based on your calculation.