Refer to the technology output given to the right that results from measured hemoglobin levels (g/dl) in 100 randomly selected adult females. the confidence level of 95% was used. a. express the confidence interval in the format that uses the "less than" symbol. assume that the original listed data use two decimal places, and round the confidence interval limits accordingly. b. identify the best point estimate of mu and the margin of error. c. in constructing the confidence interval estimate of mu, why is it not necessary to confirm that the sample data appear to be from a population with a normal distribution? tinterval left parenthesis 12.868 comma 13.354 right parenthesis x overbarequals13.111 sxequals1.227 nequals100 a. express the confidence interval in the format that uses the "less than" symbol. assume that the original listed data use two decimal places, and round the confidence interval limits accordingly.