Discussion
If 'r' is the correlation coefficient and byx and bxy are the regression coefficients of the regression lines y on x and x on y respectively, then r =
Answer: D
The correlation coefficient is the geometric mean of the two regression coefficients: r = \(\sqrt{b_{xy} \times b_{yx}}\), with the sign of the coefficients. Option (A) is their product, which equals r squared and not r. Option (B) takes a ratio, and (C) has a form that does not occur. So (D) is the answer.
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