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Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate:...

Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate: (a) find the critical value t Subscript alpha divided by 2​, ​(b) find the critical value z Subscript alpha divided by 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: nequals224​, x overbarequals31.4 ​hg, sequals6.5 hg. The confidence level is 99​%. Select the correct choice below​ and, if​ necessary, fill in the answer box to complete your choice. A. t Subscript alpha divided by 2equals nothing ​(Round to two decimal places as​ needed.) B. z Subscript alpha divided by 2equals nothing ​(Round to two decimal places as​ needed.) C. Neither the normal distribution nor the t distribution applies.

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