Posted by Shyra on Thursday, December 2, 2010 at 12:59pm.
YES!
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 14 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing time within one-quarter hour. The 95 percent level of confidence is to be used.
How many executives should be surveyed?
Population mean = 14
Population standard deviation = 2.5
Margin error = 1/4 = 0.25
level of confidence = 0.95
z = 1.96
n =[(1.96*3)/0.25]^2
=553.19
=554
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