In each case, determine whether the sample sizes are large enough to conclude that the sampling distribution of LO5 1pn 1 - pn 22 is approximately normal.

a. n1 = 12, n2 = 10, pn 1 = .50, pn 2 = .50

b. n1 = 12, n2 = 10, pn 1 = .90, pn 2 = .02

c. n1 = n2 = 40, pn 1 = .80, pn 2 = .70

d. n1 = 200, n2 = 100, pn 1 = .50, pn 2 = .01

e. n1 = 200, n2 = 200, pn 1 = .05, pn 2 = .09