For an independent-measures research study,what is measured by Cohen's d or r²? A)The risk of a Type I error B)The risk of a Type II error C)The size of the difference between the two treatments D)Whether the difference between the two treatments is likely to have occurred by chance

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Quizplus · Accepted Answer

Cohen's d measures the standardized difference between the means of two groups and indicates the size of the difference between the two treatments. It is used to estimate the effect size of the treatment, and a large effect size indicates a substantial difference between the groups. The r² is not a valid statistical measure.

For an Independent-Measures Research Study,what Is Measured by Cohen's D