Question Statement:
Which of the following statements are TRUE for the regression coefficients $b_{yx}$ and $b_{xy}$?
Options:
- (A) Both $b_{yx}$ and $b_{xy}$ must always have the same algebraic sign
- (B) Their product $b_{yx} b_{xy}$ cannot exceed $1$
- (C) If one regression coefficient exceeds $1$, the other must be less than $1$
- (D) The arithmetic mean of $b_{yx}$ and $b_{xy}$ is always greater than or equal to $|r|$