Using equivalence tests to prove zero difference between the mean and a target
Equivalence tests are new in Minitab v17. We will use an equivalence test to determine if the mean of a sample can be found to be equivalent for a target value.
These tests are similar to t-tests, but where the t-test null hypothesis is no difference, an equivalence test uses a null hypothesis of there is a difference.
The example dataset here is fill volumes of syringes. The target fill volume is 15 ml; we would like to know if the fill volumes of this process are equivalent to the goal of 15 to within +/- .25 ml around the target.
Getting ready
Open the equivalence 1 sample.mtw worksheet from the support files.
How to do it…
The following steps compare the measured volumes ...
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