1. (5 points) Var(X) = 4, Var(Y) = 1 and Cov(X, Y) - -2. What is Var ( X - Y)? (a) 1. (b) 9. (c) 3. (d) D. (c) 5. 2. (5 points) Sally Scientist obtained a 98% confidence interval for u from a random sample of normal (, 37.0) data ( known). The sample size was n = 25 and the interval she computed was 9.54 + 2.83 = (6.71, 12.37). The confidence level 98% is the probability, before sampling, (a) that X will be between 6.71 and 12.37. (b) that & is betwoon 6.71 and 12.37. (c) that X will be within 2.83 of 9.54. (d) that X will be within 2.83 of p. (e) that a Type I error is not made