Question

When two regression coefficients bear same algebraic signs, then correlation coefficient is:

• A. Positive
• B. Negative
• C. According to two signs
• D. Zero

Answer 1

Answer: (C)

According to two signs

The '+' or '-' sign is given to the correlation coefficient based on the signs of the two regression coefficients.

$r=\pm \sqrt{b_{yx}\ast b_{xy}}$

where $r$ is the correlation coefficient

$b_{yx},b_{xy}$ are the regression coefficients.