Question

Assume that we want to construct a confidence interval Do one of the following, as appropriate: (a) find the critical value 1./2. (b) find the critical value Za/2, or (c) state that neither the normal distribution nor the t distribution applies Here are summary statistics for randomly selected weights of newbom girls: n = 182. x = 29.8 hg, s= 68 hg. The confidence level is 90% Select the correct choice below and, if necessary, fill in the answer box to complete your choice OA w/2- (Round to two decimal places as needed.) B. 2/2 (Round to two decimal places as needed) OC. Neither the normal distribution northet distribution applies

Answer 1

Here we have: x = 29.8 S= 6.8 n = 182 a = 1-0.90 = 0.10 (90% confidence level) df = n-1 = 182-1 = 181 Critical value: tcrit= ta /2,df = t0.10/2,181 +1.65