Suppose X and Y are two random variables with E[X] = 1, Var (X) = 4, E[Y ] = -1, Var (Y) = 4, and Cov (X, Y) = 1. Find Var (X - Y). 0 4 0 6 0 8 O 2 O None of the aboveConsider a right tailed test with a = 0.15. What is the rejection region for this one-sided confidence bound at the 85% confidence level? O Z> 1.96 O Z > 1.036 O Z