A Regression Analysis of Students' College Grade Point Averages (GPAs) $R ^ { 2 } = 0.311$

Multiple Choice

A regression analysis of students' college grade point averages (GPAs) and their high school GPAs found $R ^ { 2 } = 0.311$ . Which of these is true?
I. High school GPA accounts for $31.1 \%$ of college GPA.
II. $31.1 \%$ of college GPAs can be correctly predicted with this model.
III. $31.1 \%$ of the variance in college GPA can be accounted for by the model

A) I only
B) II only
C) III only
D) I and II
E) none of these