Calculating the sample size for a 1-Sample equivalence test
The power and sample size tools enable us to calculate the number of samples we require to prove that a test sample is equivalent to a target or another sample.
Here, we check the number of samples required to prove that a batch of syringes have a fill volume with a mean of 15 ml. To be equivalent, the mean fill volume should be within +/- 0.25 of the target. The goal is to be able to identify that the mean is less than 0.1 different to the target, with at least 80 percent or 90 percent power.
We will use a standard deviation of 0.27 for this study.
Getting Ready
We will not open a dataset for this study. This example follows the previous recipe, Using equivalence tests to prove zero difference ...
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