Question: You are planning a study in which you predict an effect size of .50. You plan to test significance using a t test for dependent

You are planning a study in which you predict an effect size of .50. You plan to test significance using a t test for dependent means, one-tailed, with an alpha of .05.

(a) What is the power of this study if you carry it out with 20 participants?

(b) How many participants would you need to have 80% power?

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