You are planning a study in which you will use a 95% condence interval to report the difference between two proportions. Find the sample size needed for a margin of error of 0.1 if you do not have good guess at the values of the two proportions. The smallest sample size would be Suppose new information has come in and now you can say that a good guess for pf is 0.6 and p; is 0.4. What would be the smallest sample size in this case? (We will still have a margin of error of 0.1 and 95% condence). The smallest sample size would be