In constructing a confidence interval for o or o2 , a table is used to find the critical values x { and x R for values of n s101. For larger values of n, x [ and X R can be approximated by using the following formula: x2 = 7 [+ Za/2 + ~2k - 1 12 where k is the number of degrees of freedom and za/2 is the critical z score. Estimate the critical values x _ and x R for a situation in which you wish to construct a 95% confidence interval for o and in which the sample size is n = 232. A XL ~ 196.533, X = 267.173 B X- ~ 191.247, x - 275.595 C x 1 ~ 197.457, XR ~ 268.249 D XL = 190.338, ~ 274.504