What are warning limits on a control chart? How can they be used?
Answer to relevant QuestionsA manufacturer of component for automobile transmissions wants to use control charts to monitor a process producing a shaft. The resulting data from 20 samples of 4 shaft diameters that have been measured are: (a) Find the ...Consider the piston ring data shown in Table 6.3. Assume that the specifications on this component are 74.000 0.05 mm. (a) Set up x and R control charts on this process. Is the process in statistical control? (b) The ...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 ...Control chart x and s for are maintained on a process. After 25 preliminary subgroups each of size 3 are evaluated, you have the following data: (a) Set up control charts using these data. (b) Assume that the process ...Rework Exercises 6.34 and 6.35 using x and s control charts. The process is out of control on the x chart at subgroup 18. After finding assignable cause, exclude subgroup 18 from control limits calculations:
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