SOLUTION: 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 12 hours, with a sta

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Question 923323: 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 12 hours, with a standard deviation of 3.5 hours. It is desired to estimate the mean viewing time within one-quarter hour. The 90 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
thanks a million!
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
mean = 12 hours, with a standard deviation = 3.5 hours.
estimate the mean viewing time within one-quarter hour.
The 90 percent level of confidence is to be used.
ME = .25 = 1.645(3.5/sqrt(n)
n = %281.645%2A3.5%2F.25%29%5E2 = 531 rounded Up to whole number