Assume that we want to construct a confidence interval. Do one of the following as appropriate: (a) find the critical value la/z. (b) find the critical value 2/7. OF (C) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n=176, X= 28.6 hg 5-72 hg. The confidence level is 90% t Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A W12 (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. 2/2