What is the estimated effect size for a test for the difference between two population means with independent samples with sizes of 25 and 35 respectively and a pooled t-test statistic of t = -2.34?
A) 0.23
B) -0.43
C) -0.61
D) -0.16

Question

Quizplus · Accepted Answer

The effect size (Cohen's d) can be estimated using the formula: d = t * sqrt((1/n1) + (1/n2)), where n1 and n2 are the sample sizes. Substituting the given values: d = -2.34 * sqrt((1/25) + (1/35)) ≈ -0.61.

What Is the Estimated Effect Size for a Test for the Difference