The paired t-test is essentially the same as a one-sample t-test of the set of differences with a hypothesized mean of zero for the differences.

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The paired t-test compares the means of two related groups by analyzing the differences between each pair of observations and then performing a one-sample t-test on these differences, assuming a hypothesized mean difference of zero.

The Paired T-Test Is Essentially the Same as a One-Sample