Sample size to estimate mean
Use this calculator to find the minimum sample size required to estimate population mean $\mu$.
| Sample Size to estimate mean | ||
|---|---|---|
| Confidence Level ($1-\alpha$) | ||
| Standard Deviation ($\sigma$) | ||
| Margin of Error ($E$) | ||
| Results | ||
| Z value: | ||
| Required Sample Size : ($n$) | ||
Sample size required to estimate mean
The minimum sample size required to estimate the population mean $\mu$ is
$$ \begin{aligned} n &= \bigg(\frac{z*\sigma}{E}\bigg)^2 \end{aligned} $$
where
- $z=z_{\alpha/2}$ is the critical value of $Z$
- $\sigma$ is the population standard deviation
- $E$ is the margin of error.
