Refer to the technology output given to the right that results from measured hemoglobin levels (g/dl) in 100 randomly selected adult females. the tntrval confidence level of 90% was used. 13.032,13.418) x= 13.225 a. express the confidence interval in the format that uses the "less than" symbol. assume that the original listed data use two decimal places, andsx-1.164 round the confidence interval limits accordingly. b. identify the best point estimate of μ and the margin of error. c. in constructing the confidence interval estimate of μ, why is it not necessary to confirm that the sample data appear to be from a population with a normal distribution?