"We have a process for manufacturing metal shafts. The specification requires that the shaft diameter must be between 19.90 and 19.96 mm. Propose a plan for an experimental study that will demonstrate whether or not our existing process is capable of consistently producing the shafts meeting that specification. Your manager would like to see some quantitative criteria supporting your conclusion at the end of that study, so please state which numerical parameters you'll present in your report as evidence.