True mean cost per call, What sample size must you take to

True mean cost per call

Reference no: EM1312645

You are interested in determining the average cost of a 3-minute telephone call to locations within the continental U.S. What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call? From the phone company, you have gotten an estimate of = 7.71.

A) 185

B) 445

C) 406

D) 574

Reference no: EM1312645

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