Consider the joint probability distribution of X and Y from Exercise 9.7, obtained from data on hair color and eye color, for which we already computed the expectations and variances of X and Y , as...

Consider the joint probability distribution of X and Y from Exercise 9.7, obtained from data on hair color and eye color, for which we already computed the expectations and variances of X and Y , as well as E[XY ].

a. Compute Cov(X, Y ). Are X and Y positively correlated, negative correlated, or uncorrelated?

 b. Compute the correlation coefficient between X and Y .