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Paired t-test (Compare Two Average with the information of "pair")

Pair Information If the differences among samples are large, the difference of categories often seems unclearly. Paired t-test is used for the case.

With pair information is such case that

Power of Paired t-test

The diagram is an example. It is the case to compare the difference between the average of A and B. In the left diagram, we cannot confirm the difference numerically without pair information testing.

Caution to Use Paired t-test

In the right diagram, even if we use pair information, P-value is not small because unevenness ( outlier ) is large.

You may find that one of the data of B is too large. It may be good that we remove the data from testing as an outlier.

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