Question: For a post hoc power analysis, d = .60, = .05 for a two-tailed t test, and the number of people in each of two

For a post hoc power analysis, d = .60, = .05 for a two-tailed t test, and the number of people in each of two groups = 30, the power of the t-test is approximately 0.61.

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?

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