If the coefficient of determination is 0.81, the coefficient of correlation
A)is 0.6561
B)could be either + 0.9 or - 0.9
C)must be positive
D)must be negative

Question

Quizplus · Accepted Answer

The coefficient of determination (r²) is the square of the coefficient of correlation (r). Therefore, if r² = 0.81, then r could be either + 0.9 or - 0.9 (the square root of 0.81). There is no information to suggest that the correlation must be positive or negative.

If the Coefficient of Determination Is 0