statistcs, correlation

Question

The correlation between hours studied for Math class and Math grade for high school students is found to be about r = 0.75. Suppose we wish to use Math study hours x to predict Math grade y for high school students. We conclude

A) the fraction of the variation in Math grades explained by the least-squares regression line of Math grade on Math study hours is about 56%.

B) Math grade is generally 75% of Math study hours for high school students.

C) the least-squares regression line of y on x would have slope of 0.75.

D) about 75% of the time, Math study hours will accurately predict Math grade.

Answer 1

The measure, r², would explain the percentage of variation due to the regression line.

 

So, you answer would be ...