If Cov(x,y)= 20 $s _ { x } ^ { 2 } = 16$

Multiple Choice

If cov(x,y) = 20, $s _ { x } ^ { 2 } = 16$ and $s _ { y } ^ { 2 } = 49$ then the sample coefficient of correlation r is:

A) 1.400
B) 0.026
C) 0.714
D) None of these choices.