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Estimate the mean amount of time that consumers

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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 estimated as 50 minutes.

a. What sample size is needed if the executive wants to be 95% confident of being correct to within plus or minus ±4 ?minutes?

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

Reference no: EM132501820

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