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If the population standard deviation is o=10, how large a sample is necessary to have a standard error that is less than 5 points?
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If the population standard deviation is o=10, how large a sample is necessary to have a standard error that is less than 5 points?

User Narsereg
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Use the following questions & solve for n to find the sample size: sample error = o / sqrt(n). Next you would arrange equation to solve for sample size: sqrt(n) = o / sample error. Then square both sides to get: n = (o / sample error)^2.
User SimonSparks
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