What is the sample size required

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An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previous? studies, the standard deviation is assumed to be 18 minutes. The executive wants to? estimate, with? 99% confidence, the mean weekly amount of time to within 5 minutes.

a. What is the sample size required for? 99% confidence (round up to the nearest integer)

b. If? 95% confidence is? desired, how many consumers need to be? selected? (Round to the nearest whole number)

Reference no: EM132846954

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