Estimating the Sample Size Necessary to Have Enough Power

Cohen considered a ρ of .1 to be small, .3 medium, and .5 large. You need 783 pairs of scores for a small effect, 85 for a medium effect, and 28 for a large effect. In terms of percentage of variance explained, small is 1%, medium is 9%, and large is 25%. One-Sample T Test. Effect size is computed as . ................
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