Question

cIf Var (x) = 8.25, Var (y) = 33.96 and Cov (x, y) = 10.2, then the correlation coefficient is

• A. 0.89
• B. – 0.98
• C. 0.61
• D. – 0.16

Answer 1

Answer: (C)

0.61

Answer 2

$r _ { x y } = \frac { \operatorname { Cov } ( x , y ) } { \sqrt { \operatorname { Var } ( x ) \cdot \operatorname { Var } ( y ) } } = \frac { 10.2 } { \sqrt { ( 8.25 ) ( 33.96 ) } } = 0.61$ .