Construct the indicated confidence interval for the difference between population proportions Assume that the samples are independent and that they have been randomly selected.
x1 = 39, n1 = 61 and x2 = 49, n2 = 81; Construct a 95% confidence interval for the difference between population proportions p1 - p2.
0.478 < p1 - p2 < 0.801
-0.126 < p1 - p2 < 0.195
0.448 < p1 - p2 < 0.830
-0.157 < p1 - p2 < 0.830