Exercise 3.2 Aluminum profile The length of an aluminum profile is checked by taking a sample of 16 items whose length is measured. The measurement results from this sample are listed below, all measurements are in mm: 180.02 180.00 180.01 179.97| 179.92 180.05 179.94 | 180.10 180.24 180.12 180.13 180.22 179.96 | 180.10 179.96 180.06 From data is obtained: = 180.05 and s = 0.0959. It can be assumed that the sample comes from a population which is normal distributed. a) A 90%-confidence interval for u becomes? b) A 99%-confidence interval for o becomes?