Use Power and Sample Size for 1-Sample Equivalence Test to examine the relationship between power, sample size, and difference when you want to evaluate the equivalence between the mean of a product or process and a target value.

Use these calculations for the following reasons:

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

For example, a quality analyst wants to determine whether the mean force required to open snack bag seals is within 10% of the target value of 4.2 N (Newtons). Before collecting the data for a 1-sample equivalence test, the analyst uses a power and sample size calculation to determine how large the sample must be to obtain a power of 80% (0.8).

To perform a power and sample size calculation for a 1-sample equivalence test, choose

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