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Paired T-Test

Definition of Paired T-Test:

The two-sample t-test is used to determine if two population means are equal. The data may either be paired or not paired.

For a paired t-test, the data is dependent (i.e., there is a one-to-one correspondence between the values in the two samples).

For example, same subject measured before and after a process change, or same subject measured at different times.

For unpaired t test, the sample sizes for the two samples may or may not be equal.

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