Mortgage rates: Following are interest rates (annual percentage rates) for a 30-year fixed rate mortgage from a sample of lenders in Macon, Georgia, on June 20, 2013. Assume that the population is approximately normal. 4.551 4.762 4.131 4.415 4.644 4.856 4.432 3.937 4.846 4.308 4.352 4.283 Send data to Excel Part: 0 / 3 Part 1 of 3 (a) Find the sample standard deviation s. Round the answer to at least four decimal places. The sample standard deviation s is |0.2844 X Part: 1 / 3 Part 2 of 3 (b) Construct a 98% confidence interval for the population standard deviation o. Round the answers to at least two decimal places. A 98% confidence interval for the population standard deviation is 4.24