Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t12. (b) find the critical value z12. or (e) state that neither the normal...

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Extracted text: Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t12. (b) find the critical value z12. or (e) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n= 168, x= 29.3 hg, s=7.7 hg. The confidence level is 95% Select the correct choice below and, if necessary, fil in the answer box to complete your choice. OA /2 (Round to two decimal places as needed.) OB. (Round to two decimal places as needed.) OC. Neither the normal distribution nor the t distribution applies.