Author Question: If X and Y are independent random variables, which of the following identities is false? a. COV(X, ... (Read 78 times)

mcmcdaniel · **on:** Jun 24, 2018

If X and Y are independent random variables, which of the following identities is false?
a. COV(X, Y) = 1
b. E(X + Y) = E(X) + E(Y)
c. V(X + Y) = V(X) + V(Y)
d. All of these choices are true.

Question 2

If X and Y are any random variables with E(X) = 5, E(Y) = 6, E(XY) = 21, V(X) = 9 and V(Y) = 10, then the relationship between X and Y is a:
a. strong positive relationship
b. strong negative relationship
c. weak positive relationship
d. weak negative relationship