Question 9 of 14 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 84.6, n=70, s 18, 80 % confidence E= == 0.00 Round to two decimal places if necessary 0.00 < < 0.00 Round to two decimal places if necessary b. x 38.2, n=43, 8 13.7, 98% confidence SUBMIT QUESTION