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 z12, or (c) state that neither the normal distribution nor the t applies. Here are summary statistics for randomly selected weights of newborn girls: n= 299, x= 33.6 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. O A. ta/2= (Round to two decimal places as needed.) O B. Za/2 (Round to two decimal places as needed.) OC. Neither the normal distribution nor the t distribution applies.

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