The Question:

In a random sample of 78 Cleveland postal carriers, 1 5 had been bitten during the previous week; in a random sample of 85 Philadelphia postal carriers, 17 had been bitten during the previous week. With or = 0.10, test the claim that a smaller proportion of postal carriers are bitten in Cleveland. (a) X, =_ ( b ) n , (c) X2 = = (d) n2 (e) Xc (f) nc = - (8) Pc = - SE1 = pc.(1-Pc) = 0.04498 SE2 = n1 Pc.(1-Pc) = 0.0431 SET = SE2 + SE2 n2 1 2 (h) SET = (i) Ho: () HA: (k) null value = . (L) Test type =. (m) Sample Statistic = _ (n) Z statistic = (o) p-value = _ (p) Decision =