A repeated-measures study and matched-subjects study both produce t statistics with df = 20.The repeated-measures study used more participants than the matched-subjects study.

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The degrees of freedom for a t-test depend on the sample size, with larger sample sizes leading to higher degrees of freedom. Therefore, if both the repeated-measures study and matched-subjects study had the same number of participants, they would have the same degrees of freedom. The fact that the repeated-measures study used more participants does not necessarily mean that they will have higher degrees of freedom, as they could have used a repeated-measures design with fewer independent groups or conditions.

A Repeated-Measures Study and Matched-Subjects Study Both Produce T Statistics