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An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional...

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Basic Math

An advertising executive wants to estimate the mean weeklyamount of time consumers spend watching traditional televisiondaily. Based on previous​ studies, the standard deviation isassumed to be 21 minutes. The executive wants to​ estimate, with​99% confidence, the mean weekly amount of time to within ± 6minutes.

a. What sample size is​ needed?

b. If​ 95% confidence is​ desired, how many consumers need tobe​ selected?

Answer & Explanation Solved by verified expert
4.1 Ratings (812 Votes)
Solution Given thatstandard deviation 21margin of error E 6a    See Answer
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