13.4 Independent random samples of ceramic produced by two different processes were tested for hardness. The results were:

Process 1 Process 2 8.8 9.6 8.9 9.2 9.9 9.4 9.2 10.1 9.2 9.5 10.2 9.5 9.8 9.5 9.3 9.2

(a) We will assume that the observations come from normal(p1,a’) and normal(p2, 02), where u2 = .42. Use independent normal (m, s’) prio