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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
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 17 hours, with a standard deviation of 4.5 hours. It is desired to estimate the mean viewing time within one-quarter hour. The 99% 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.) |
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