A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 13 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing time within 30 minutes. The 98% level of confidence is to be used. (Use z Distribution Table.) How many executives should be surveyed? (Round your z-score to 2 decimal places and round up your final answer to the next whole number.) Number of executives
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We want to estimate the mean viewing time within 30 minutes. This means our margin of error is 0.5 hours (30 minutes = 0.5 hours). Show more…
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