Medium
Hierarchical Regression
SPSS
Free
A psychologist is predicting GPA (Y) from (Step 1) high school GPA and SAT score, then (Step 2) adds hours studied per week. SPSS shows: Model 1 R² = .42; Model 2 R² = .50; R² Change = .08; F Change = 6.40; p = .013. Which statement is the best interpretation?
A
Hours studied significantly improves prediction of GPA beyond high school GPA and SAT, explaining an additional 8% of variance.
B
Hours studied explains 50% of GPA by itself, so it is the strongest predictor in the model.
C
Because R² is .50 in Model 2, the model is overfitting and must be rejected.
D
The Step 2 variable cannot be interpreted because hierarchical regression requires all predictors to be entered at once.