Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t,/2, (b) find the critical value z,12, or (c) state that neither the...

Extracted text: Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t,/2, (b) find the critical value z,12, 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= 178, x = 28.1 hg, s= 7.9 hg. The confidence level is 95%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. ta/2= (Round to two decimal places as needed.) В. Za12 (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies.