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Sample Size for Population Mean Estimation

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An advertising agency that serves a major radio station wants to estimate the mean amount of time that the station's audience spends listening to the radio daily. From past studies, the standard deviation is estimated as 45 minutes.

a. What sample size is needed if the agency wants to be 90% confident of being correct to within ± 5 minutes?
b. If 99% confidence is desired, what sample size is necessary?

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The solution gives the method of estimating the sample size. Step by step procedure is given with interpretation of results obtained.

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An advertising agency that serves a major radio station wants to estimate the mean amount of time that the station's audience spends listening ...

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