In a repeated-measures study comparing two treatments with a sample of n = 15 participants,the researcher measures two scores for each individual to obtain a total of 30 scores.The repeated-measures t statistic for this study has df = 29.

Question

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The degrees of freedom (df) for a repeated-measures t-test is calculated based on the number of subjects, not the total number of scores. For n = 15 participants, df = n - 1, so df = 14, not 29.

In a Repeated-Measures Study Comparing Two Treatments with a Sample