For a repeated-measures study comparing three treatment conditions with a sample of n = 4 participants, the participant totals (the P values) are 3, 6, 9, and 6.What is the value for SS_b_{etween subjects}?

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Quizplus · Accepted Answer

SS_between subjects is calculated by summing the squared deviations of each participant's total from the grand mean, then multiplying by the number of treatments. Here, the grand mean is 6, and the deviations are -3, 0, 3, 0. Squaring these gives 9, 0, 9, 0, summing to 18. Dividing by the number of treatments (3) gives 6.

For a Repeated-Measures Study Comparing Three Treatment Conditions with a Sample