Answer to Question #46537 in Statistics and Probability for Jeshani

Question

Metal conduits or hollow pipes are used in electrical wiring. In testing 1-inch pipes, these data are obtained on the outside diameter (in inches) of the pipe: 1.21, 1.19, 1.20, 1.22, 1.18, 1.23, 1.17, 1.09. Assume that sampling is from normal distribution with mean and variance .
i.Find unbiased estimates for and .
ii.Find 95% confidence interval on the mean outside diameter of pipes of this type.