Determine the margin of error for a 99​% confidence interval to estimate the population proportion with a sample proportion equal to 0.60 for the following sample sizes. a. nequals125 b. nequals220 c. nequals250 LOADING... Click the icon to view a portion of the Cumulative Probabilities for the Standard Normal Distribution table. a. The margin of error for a 99​% confidence interval to estimate the population proportion with a sample proportion equal to 0.60 and sample size nequals125 is nothing. ​(Round to three decimal places as​ needed.)