A Professor Runs a Regression to See How Students' Exam

Multiple Choice

A professor runs a regression to see how students' exam scores (Y) are related to their homework
Grades (X) . The R2 of the regression is 21%. What does R2 tell us?

A) 21% of the variation in the exam scores is explained by the regression analysis.
B) 21% of students have their grades accurately predicted by the regression equation.
C) none of these
D) 21% of each student's exam grade will be determined by their homework grade.
E) Exam scores are not related to homework grades since 21% is greater than 5%.