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 - 194, x =30.6 hg, s = 6.1 hg. The confidence level is 90%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/ 2 = (Round to two decimal places as needed.) O B. Za/2= (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies