A researcher reports that the mean difference in response time to an auditory versus a visual cue is 0.83 seconds,with a pooled sample variance equal to 2.45.What is the effect size for this test using estimated Cohen's d?
A)d = 0.53;medium effect size
B)d = 0.53;large effect size
C)d = 0.34;small effect size
D)d = 0.34;medium effect size

Question

Quizplus · Accepted Answer

Cohen's d = (Mean difference) / (Pooled sample standard deviation) = 0.83 / 1.56 = 0.53, which is a medium effect size.

A Researcher Reports That the Mean Difference in Response Time