Use to calculate one of the following parameters for a 2-sample equivalence test:

·    Sample size

·    Difference (or ratio)

·    Power

When you enter values for any two of these parameters, Minitab solves for the third. See, Power for equivalence tests for further discussion.

You plan to test whether the amount of active ingredient in a generic brand of pain reliever is within 1 mg of the amount in a popular brand of pain reliever. You want to determine the sample size that is required to achieve a power of 0.9 for the test.  From previous samples, you estimate that the standard deviation is 0.41.