Question

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. 4.286 4.325 4.134 4.581 4.908 4.429 4.689 3.319 4.84 4.568 4.847 4.996 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 deviations is

construct a confidence interval for the population standard deviation:

based on the confidence interval, is it reasonable to believe that the population standard deviation is greater than 0.7 explain

Answer 1

4. 266 4.325 4.134 4.581 4.908 4.429 4 689 3.319 4.84 4.568 4.847 4.996 Exi 4.28 6 + 4.325tr.. ty. By 7+ 4.996 4.4935 12 1 {(xi-X) 2 n-1 - [14.266-4.4938)= --- + 14.996-4.493532) 0.2096 s- 50.2096 0.4578 = Standard deviation. Now, C.D for o. (n-1) 5² (n-1) s² 2 o L dith (n-1) Linnen (n-1), & 12 We don't haue Confidence 2026 internal here. so. I end up with stadensation = 0.4578 Please like