Statistics > Sample Size > 1-Population Mean

This tool determines the sample size required to estimate a population mean. You will need to provide the confidence level, desired margin of error, and population standard deviation. The sample size is computed using the following formula:

where zα/2 is the inverse cumulative probability of the z distribution at 1 - &alpha/2, σ is the population standard deviation, and E is the margin of error.

To use this tool, provide the following inputs to the dialog: