K 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 zo /2. or (c) state that neither the normal distribution nor the t distribution applies. A Here are summary statistics for randomly selected weights of newborn girls: n=186, x =30.1 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. OA. tax/27 (Round to two decimal places as needed ) OB. Z / 2 (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies