Consider the sampling scheme proposed in Exercise 5.11. Is this scheme appropriate if the assignable cause results in a slow, prolonged upward drift in the mean? If your answer is no, propose an alternative procedure.
Answer to relevant QuestionsWhat information is provided by the operating characteristic curve of a control chart? Apply the Western Electric rules to the control chart presented in Exercise 5.19. Would these rules result in any out-of-control signals? A process is normally distributed and in control, with known mean and variance, and the usual three-sigma limits are used on the x control chart, so that the probability of a single point plotting outside the control limits ...Rework Exercise 6.8 using the s chart. In Exercise 6.8 Parts manufactured by an injection molding process are subjected to a compressive strength test. Twenty samples of five parts each are collected, and the compressive strengths (in psi) are shown in Table 6E.12. (a) Establish ...
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