Refer to the technology output given to the right that results from measured hemoglobin levels (g/dL) in 100 randomly selected adult females. TInterval The confidence level of 99% was used. (12.927, X = 13.22 a. What is the number of degrees of freedom that should be used for finding the critical value to / 2? Sx = 1.1 b. Find the critical value to / 2 corresponding to a 99% confidence level. n= 100 c. Give a brief description of the number of degrees of freedom. a. What is the number of degrees of freedom that should be used for finding the critical value to /2? There are | degrees of freedom. (Type a whole number.)Refer to the technology output given to the right that results from measured hemoglobin levels (g/dL) in 100 randomly selected adult females. TInterval The confidence level of 99% was used. (12.895,13.591) x = 13.243 a. Express the confidence interval in the format that uses the "less than" symbol. Assume that the original listed data use two decimal places, Sx = 1.324 and round the confidence interval limits accordingly. n = 100 b. Identify the best point estimate of u and the margin of error. c. In constructing the confidence interval estimate of u, why is it not necessary to confirm that the sample data appear to be from a population with a normal distribution? 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. g/dL