95% confidence interval about the population mean
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The number of hours that a network server was down each month of the previous year is: 4, 4, 5, 1, 5, 1, 1, 2, 1, 2, 1, 2. Place a 95% confidence interval about the population mean number of down hours per month.
My thoughts:
mean = 29 / 12 = 2.4167
mean + Z(0.025) * s/sqrt(n)
mean - Z(0.025) * s/sqrt(n)
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Solution Summary
It shows how to calculate the 95% confidence interval about the population mean. A network server for previous years are determined.
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It I correct that mean = 2.417
We need to compute the variance of the sample by:
Var = 1/(N-1)*∑(X-mean)^2 = 2.629
(where N = ...
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