8.94 Sample size and the margin of error. In Section 8.1, we studied the effect of the sample size on the margin of error of the confidence interval for a single proportion. In this exercise, we perform some calculations to observe this effect for the two-sample problem. Suppose that and and n represents the common value of n₁ and n₂. Compute the 95% margins of error for the difference between the two proportions for n = 60, 70, 80, 100, 400, 500, and 1000. Present the results in a table and with a graph. Write a short summary of your findings.