Question: An article in Technometrics studied the capability of a gauge by measuring the weight of paper. The data for repeated measurements of one sheet of paper are in the following table. Construct a 95% one sided, upper confidence interval for the standard deviation of these measurements. Check the assumption of normality.

3.481 3.448 3.485 3.475 3.472

3.477 3.472 3.464 3.472 3.470

3.470 3.470 3.477 3.473 3.474