Suppose you want to estimate the difference between two population means correct to within 1.2 With a 90% condence inten/al. lf prior information suggests that the population variances are approximately equal to 6% = 6% = 15 and you want to select independent random samples of equal size from the populations. how large should the sample sizes, 1'11 and n2, be? The sample sizes should be n1 = n2 = (Round up to the nearest integer.)