DrKim Thinks His Regression Equation Is Very Accurate, but He

Multiple Choice

Dr.Kim thinks his regression equation is very accurate, but he wonders if perhaps the mean is just as good at predicting scores as the regression equation.He knows that the correlation coefficient (r) for the two variables is quite high, -0.82.Should Dr.Kim use the mean or the regression equation to predict scores?

A) He should use the regression equation because the proportionate reduction in error (r²) is low.
B) He should use the regression equation because the proportionate reduction in error (r²) is high.
C) He should use the mean because the proportionate reduction in error (r²) is low.
D) He should use the mean because the proportionate reduction in error (r²) is high.