1 Calculate the two-sided 95% confidence interval for the population standard deviation (sigma) given that a sample of size n-9 yields a sample standard deviation of 17.45. Your answer: O 13.14 sigma 1.41 O 11.79 sigma 33.43 9.87 sigma <0,47 20.76 sigma 55.11 8.64 sigma 21.87 O 2.23 sigma 23.35 O 22.35 sigma 59.39 O 21.43 sigma 31.59 O 12.13 sigma-56.65 O 5.97 sigma 32.92 Clear