Average cost of three minute phone call

Reference no: EM1394322

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 received an estimate of = 7.71.

Reference no: EM1394322

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