Determine the margin of error for a confidence interval to estimate the population mean with n=31 and o = 44 for the following confidence levels. a) 90% b) 95% c) 97% Click the icon to view the cumulative probabilities for the standard normal distribution. a) With a 90% confidence level, the margin of error is (Round to two decimal places as needed.) b) With a 95% confidence level, the margin of error is (Round to two decimal places as needed.) c) With a 97% confidence level, the margin of error is (Round to two decimal places as needed.)