試題詳解

14. Comparing the multiple coeficient of determination, r², and adjusted multiple coefficient of determination, r²a, for the same regression model, which of the following statements is correct?
(A)When an additional independent variable is added to the model, r² will always increase;
(B)When an additional independent variable is added to the model, r²a will always increase;
(C)r²a can be greater than r²;
(D) Both (a) and (b) are right.