Question: Suppose you are planning to do a study where you will use a one-sample t-test. On the basis of past research, you think that the

Suppose you are planning to do a study where you will use a one-sample t-test. On the basis of past research, you think that the effect size you are trying to detect may be approximately equal to Cohen d = .30. You plan to use a = .05 non-directional two-tailed If you want the power of .80 what minimum N do you need in the sample?

If you can afford to have only N=20 participants in the sample, approximately what is the expected level of statistical power?

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