Calculate the r² statistic for t = 2.56 and two groups of 20 individuals each. A) .06 B) .15 C) .25 D) .27

Question

Quizplus · Accepted Answer

The r² statistic is a measure of the effect size of the difference between two independent groups, where the groups each have a continuous variable. It is calculated as t/(sqrt(n1) + sqrt(n2)), where t is the t-statistic from the independent samples t-test, and n1 and n2 are the sample sizes for each group. With t = 2.56 and n1 = n2 = 20, r² is calculated as 2.56/(sqrt(20) + sqrt(20)) = 0.152, which is closest to option B, .15.

Calculate the R2 Statistic for T = 2

Calculate the R² Statistic for T = 2