The paired-samples t-Test is used when the two groups of values that we want to compare are connected or related to each other in some way.

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The paired-samples t-Test is used to compare the means of two groups of related or connected values. For example, we might use it to compare the test scores of a group of students before and after they undergo a new teaching method. In this case, the scores are connected or related because they come from the same group of students.

The Paired-Samples T-Test Is Used When the Two Groups of Values