8.77 Independent random samples of n = n = n observations are to be selected from each of two bino- mial populations 1 and 2. If you wish to estimate the difference in the two population proportions correct to within 0.05, with probability equal to 0.98, how large should n be? Assume that you have no prior informa- tion on the values of p1 and p2, but you want to make certain that you have an adequate number of observa- tions in the samples.