What is the formula for the correlation coefficient in terms of the cov?

The covariance, denoted cov, is computed from:

cov = 1/(n-1) * [E](X - X(bar))(Y - Y(bar))

What is the formula for the correlation coefficient in terms of the cov?




a. cov / s(subx)
b. cov / (s(subx) * s(suby))
c. cov / s(subx)^2
d. cov / s(suby)^2
e. (s(suby) / s(subx)) * cov


Answer: b. cov / (s(subx) * s(suby))


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