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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 week is 13 hours, with a standard deviation of 3.0 hours. it is desired to estimate the mean viewing time within one-quarter hour. the 95% level of confidence is to be used.

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Missing question: How many executives should be surveyed?

Solution:
Mean = 13 hours
SD = 3 hours
Confidence level = 95%

Mean viewing time within a quarter of an hour = 0.25 = 1.96*3/sqrt (N)

Where N = Sample population

N = {(1.96*3)/0.25}^2 = 553.19 ≈ 554

Therefore, 554 executives should be surveyed to yield such results.

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