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 two-quarter hour. The 98 percent level of confidence is to be used.
How many executives should be surveyed? (Round up your answer to the next whole number.)
Number of executives
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