Question 930151: I cannot figure this out...
A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99 percent level of confidence.
How large a sample is required? (Round up your answer to the next whole number.)
Sample required is .
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Use the formula n = ( (z*sigma)/E )^2
where in this case
n = unknown
z = 2.576 (found using a calculator; based off the 99% confidence interval)
sigma = 9
E = 2
So,
n = ( (z*sigma)/E )^2
n = ( (2.576*9)/2 )^2
n = 134.374464
n = 135 ... round UP to the nearest whole number
Min Sample Size is n = 135
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