Question: Analysis: A priori: Compute required sample size Input: Tail(s) Effect size d err prob Power (1- err prob) Output: Allocation ratio N2/N1 Noncentrality parameter

Analysis: A priori: Compute required sample size Input: Tail(s) Effect size d err prob Power (1- err prob) Output: Allocation ratio N2/N1 Noncentrality parameter 6 Critical t Df Sample size group 1 Sample size group 2 Total sample size Actual power = Two = -0.692 0.05 .80 1 -2.8531891 -1.9965644 = 66 34 = 34 68 = 0.8027496

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