An independent-measures study produces t(21)= 3.00,p

Question

An independent-measures study produces t(21)= 3.00,p < .01.For this study,if effect size is measured with r²,then r² = 9/30.

Quizplus · Accepted Answer

The given statement is correct. The value of r² is provided in the question as 9/30, which equals 0.3. As per Cohen's guidelines for effect size interpretation, an effect size of d=0.3 is considered a medium effect size. Hence, the t-value of 3.00 and the significant p-value indicate that the observed difference between the groups is likely not due to chance, and the effect size is medium.

An Independent-Measures Study Produces T(21)= 3