Medium
Effect Sizes
SPSS
Free
In a multiple linear regression predicting GPA from hours studied and test anxiety, SPSS Model Summary reports R = .50 and R Square = .25. Which statement BEST describes the effect size here?
A
R Square = .25 means the predictors explain 25% of the variance in GPA (overall model effect size).
B
R = .50 means the predictors explain 50% of the variance in GPA.
C
R Square = .25 means 25% of students will increase their GPA if they study more and reduce anxiety.
D
R Square = .25 means each predictor has a medium effect size.