A machine produces parts with the lengths which are normally distributed with ? = 0.66. A sample of 12 parts has the mean length of 76.12.
(a) Provide a point estimate for ?. (Give your answer correct to two decimal places.)
(b) Determine the 95% confidence maximum error of estimate for ?. (Give your answer correct to three decimal places.)
(c) Determine the 95% confidence interval for ?. (Give your answer correct to three decimal places.)
Lower Limit
Upper Limit