Overview for Power and Sample Size for 1 Variance

Use Power and Sample Size for 1 Variance to examine the relationship between power, sample size, and the ratio when you want to compare the variance or the standard deviation of a population to a target or reference value. Use these calculations for the following reasons:

Before you collect data for a 1 variance test, to ensure that your test has an adequate sample size to achieve acceptable power
After a 1 variance test, to improve the design for the next test

For example, a quality analyst wants to determine whether the variance in the moisture content in a sample of lumber is too high. Before collecting the data for a 1 variance test, the analyst uses a power and sample size calculation to determine what the power of the test will be with different sample sizes.

Where to find this analysis

To perform a power and sample size calculation for a 1 variance test, choose Stat > Power and Sample Size > 1 Variance.