4. (15 points) Prove the followings. (a) (5 points) If cov(X,Y) = 0, X and Y are unrelated. (b) (5 points) cov(X, aY) =
Posted: Mon Nov 15, 2021 11:10 am
4. (15 points) Prove the followings. (a) (5 points) If cov(X,Y) = 0, X and Y are unrelated. (b) (5 points) cov(X, aY) = acov(X,Y). b (c) (5 points) cov(aX + b, ay) = a_cov(X,Y). =