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QUESTION
For a post hoc power analysis, assume that d = .60, a = .05 for a two-tailed t test, and the number of people in each of the two groups = 30.
For a post hoc power analysis, assume that d = .60, a = .05 for a two-tailed t test, and the number of people in each of the two groups = 30. What is the appropriate power of the t test, and what was the risk of a type II error?
For the same effect size (.60), approximately what n per group would be needed to achieve power = .80?
