A machine produces parts with lengths that are normally distributed with ? = 0.55. A sample of 10 parts has a mean length of 76.05.
(a) Give a point estimate for ?. (Give your answer correct to two decimal places.)
(b) Find the 99% confidence maximum error of estimate for ?. (Give your answer correct to three decimal places.)
(c) Find the 99% confidence interval for ?. (Give your answer correct to three decimal places.)