(b) Use the multiple comparison procedure to determine which population proportions differ significantly. Use a 0.05 level of significance. A multiple comparison procedure is done to determine if any two populations are significantly different from one another. This procedure can be done when there are at least 3 populations being compared. The first step is to compute the absolute value of each of the differences, Ip; - pil, for populations / and j. We previously found the following sample proportions. P1 = 0.576 P2 = 0.48 P3 = 0.45 Find the absolute value of the difference in population proportions for populations / = 1 and j = 2. IP1 - P21 = 0.576 - Find the absolute value of the difference in population proportions for populations / = 1 and j = 3. IP1 - P31 = 0.576 - Find the absolute value of the difference in population proportions for populations / = 2 and j = 3. IP2 - P31 = 0.48