Sample Size Calculator for a Mean

This calculator determines the sample size based on the confidence level, desired margin of error, and population standard deviation.

How to Use Sample Size Calculator for a Mean?

First, input the confidence level, desired margin of error, and population standard deviation.
Now press the 'Calculate' button.
Finally, the tool shows the sample size required to estimate a population mean.

The sample size for a population mean is calculated using the following formula:

Sample Size (s) = (Z_α/2 × σ/E)²

Where,
Z_α/2 = Z critical value associated with the confidence level,
E = Desired margin of error,
σ = Population standard deviation.