A repeated-measures study and an independent-measures study both produce a t statistic with df = 20.The repeated-measures study used more subjects than the independent-measures study.

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In a repeated-measures study, each subject is measured more than once, which means the number of subjects can be less to achieve the same degrees of freedom (df) as an independent-measures study, where each measurement comes from a different subject.

A Repeated-Measures Study and an Independent-Measures Study Both Produce a T