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An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the standard deviation is

An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the standard deviation is estimated at 45 minutes.

a. What sample size is needed if the executive wants to be 90% confident of being correct to within +/- 5 minutes?

b. If 99% confidence is desired, how many consumers need to be selected?

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