Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value to / 2, (b) find the critical value Za /2, or (c) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n = 160, x = 28.2 hg, s = 6.5 hg. The confidence level is 99%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. to/2= (Round to two decimal places as needed.) OB. Za/ 2= (Round to two decimal places as needed.) OC. Neither the normal distribution nor the t distribution applies