Suppose you want to estimate the difference between two population means correct to within 1.9 with a 99? % confidence interval. if prior information suggests that the population variances are approximately equal to sigma subscript 1 superscript 2equalssigma subscript 2 superscript 2equals11 and you want to select independent random samples of equal size from the? populations, how large should the sample? sizes, n 1 and n 2? , ? be?

the sample sizes should be n 1 equals n