Calculate the margin of error and construct the confidence interval for the population mean using the Student's t-distribution (you may assume the population data is normally distributed). T-Distribution Table a. x =80.3, n=63, s=19.1, 98% confidence E= Round to two decimal places if necessary < < Round to two decimal places if necessary b. x =31.9, n=43, s=19.8, 95% confidence E= Round to two decimal places if necessary < < Round to two decimal places if necessary