Determine the margin of error for an 80% confidence interval to estimate the population mean with a = 48 for the following sample sizes. a) n = n = 31 b) n = 44 c) n = 65 Click the icon to view the cumulative probabilities for the standard normal distribution. a) When n = 31, the margin of error for an 80% confidence interval is (Round to two decimal places as needed.) b) When n= 44, the margin of error for an 80% confidence interval is (Round to two decimal places as needed.) c) When n = 65, the margin of error for an 80% confidence interval is (Round to two decimal places as needed.)