Here are summary statistics for randomly selected weights of newborn girls: n = 36, x = 3222.2 g, s = 686.7 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. ta /2 = (Round to two decimal places as needed.) b. Find the margin of error. rofe mpla E = 9 (Round to one decimal place as needed.) c. Find the confidence interval estimate of u. 9