D Question 11 2 pts cements If you are using the chi-square distribution to estimate an unknown population variance or, what is ents the upper (right-hand tail) value of a chi-square distribution you should use if your sample size is 10 ions and the given confidence level is 90%? O 16.919 o Video O 19.675 3.325 O 18.307 orations 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? Webex (Use a formula from Section 6.9) Climate LTIR ation O (3.932, 17.435) 365 (4.256, 21.654)