A sample of n = 16 scores produces a t statistic of t = 2.00.If the sample is used to measure effect size with r²,what value will be obtained for r²? A)r² = 2/20 B)r² = 4/20 C)r² = 2/19 D)r² = 4/19

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Quizplus · Accepted Answer

The formula for calculating effect size using r (Cohen's r) from a t-test is r = sqrt(t^2 / (t^2 + df)), where df (degrees of freedom) is n - 1 for a one-sample t-test. Here, n = 16, so df = 15. Plugging in the values, r = sqrt(2^2 / (2^2 + 15)) = sqrt(4 / 19), which corresponds to choice D.

A Sample of N = 16 Scores Produces a T