Plz answer both

D Question 11 2 pts If you are using the chi-square distribution to estimate an unknown population variance o', what is the upper (right-hand tail) value of a chi-square distribution you should use if your sample size is 10 and the given confidence level is 90%? 16.919 19.675 3.325 O 18,307 D Question 12 2 pts In the same situation as that in Question 11 (Sample size = 10, confidence level = 90%) and now you are given that the sample standard deviation s - 8, finish finding the confidence interval for o (Use a formula from Section 6.9) O (3.932, 17.435) O (4.256, 21.654) O (4.728, 24.06)