The paired samples t-test tests the null hypothesis that the mean difference between the before and after test scores is zero.

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The paired samples t-test is used to test whether there is a statistically significant difference between two sets of scores that are paired or matched in some way, such as before and after scores for the same group of participants. The null hypothesis is that the mean difference between the two sets of scores is zero.

The Paired Samples T-Test Tests the Null Hypothesis That the Mean