1. Related Sample t-test A related sample t-test is used when participants in the two groups are not independent of participants in the other groups. – Repeated measures – when participants in both groups are the same person – Matched samples – when participants in both groups are different, but related on some factor

2. Formula For Related Samples

3. Computational Formula

4. Decision Making for Repeated Measures t-tests The logic for rejecting or retaining the null for a repeated measures t-test is the same as for other hypothesis tests