Question From experience, a bearing manufacturer knows that it can produce roller bearings to the stated dimensions of 2.00 mm within a standard deviation of 0.061 mm. As part of its quality assurance program, engineering takes samples from boxes of bearings before shipment and measures them. On one occasion, a sample size of 25 bearings is obtained with the result xˉ=2.03\bar{x} = 2.03xˉ=2.03 mm. The z-value for these measurements is 2.459. a) What is the null hypothesis? b) Do the measurements support the hypothesis that μ=2.00\mu = 2.00μ=2.00 mm for the whole box at a 95% confidence level? c) Interpret the results.