The Pearson Correlation Between X₁ and Y Is R =

Multiple Choice

The Pearson correlation between X₁ and Y is r = 0.40 and SS_Y = 100.When a second variable, X₂, is added to the regression equation, we obtain R² = 0.25.How much additional variance is predicted by adding the second variable compared to using X₁ alone?

A) 9 points
B) 15 points
C) 25 points
D) 40 points