Solved: An advertising agency that serves a major radio station, Basic Statistics

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An advertising agency that serves a major radio station

Question: An advertising agency that serves a major radio station wants to estimate the mean amount of time that the stations 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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