It Has Been Hypothesized That Overall Academic Success for Freshmen

Multiple Choice

It has been hypothesized that overall academic success for freshmen at college as measured by grade point average (GPA) is a function of IQ scores (X₁) , hours spent studying each week (X₂) , and one's high school average (X₃) . Suppose the regression equation is: Y' = -6.9 + 0.055X₁ + 0.107X₂ + 0.0083X₃.
The multiple standard error is 6.313 and R²= 0.826. Assuming other independent variables are held constant, what effect on the GPA will there be if the numbers of hours spent studying per week increases from 32 to 36?

A) 3.1446
B) -0.824
C) +0.428
D) -0.428
E) +0.824