Which of the following statements is incorrect?

A. The coefficient of determination is defined as r.

B. If r=0.70, it implies that 70% of the

variation in Y is explained by the regression line.

C. If r=0.64 then r=0.4096.

D. The coefficient of correlation r can never be negative.

E. r indicates the strength and the direction of the relationship between X and Y variables.