12. Let X1, ..., Xn ~ Poisson()). (a) Let do > 0. Find the size o Wald test for Ho : A = do versus H1 : > # do. (b) (Computer Experiment.) Let do = 1, n = 20 and a = .05. Simulate X1, . .., Xn ~ Poisson(do) and perform the Wald test. Repeat many times and count how often you reject the null. How close is the type I error rate to .05