Which Statement Is Not True About Partial Regression Coefficients

Multiple Choice

Which statement is not true about partial regression coefficients?

A) The beta coefficients are the partial regression coefficients obtained when all the variables (Y,X₁,X₂...Xk) have been standardized to a mean of 0 and a variance of 1 before estimating the regression equation.
B) The combined effects of X₁ and X₂ on Y are additive.In other words,if X₁ and X₂ are each changed by one unit,the expected change in Y would be (b₁ + b₂) .
C) Partial regression coefficients have an order associated with them.
D) Both A and B are not true.