Here are summary statistics for randomly selected weights of newborn girls: n = 36, x = 3227.8 g, s=686.4 g. Use a confidence level of 95% to complete parts (a) through (d) below. a. Identify the critical value to /2 used for finding the margin of error. to /2 = (Round to two decimal places as needed.) b. Find the margin of error. E = 9 (Round to one decimal place as needed.) c. Find the confidence interval estimate of u. g