Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value ta/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=225, x=29.2 hg, s= 7.1 hg. The confidence level is 99%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice OA. ta/2 (Round to two decimal places as needed.) GPOO OB. Za/2 (Round to two decimal places as needed.). OC. Neither the normal distribution nor the t distribution applies.