Discuss the logic underlying the use of three-sigma limits on Shewhart control charts. How will the chart respond if narrower limits are chosen? How will it respond if wider limits are chosen?
Answer to relevant QuestionsWhat are warning limits on a control chart? How can they be used? Rework Exercise 6.9 using the s chart. In Exercise 6. Table 6E.9 presents 20 subgroups of five measurements on the critical dimension of a part produced by a machining process. (a) Set up x and R control charts on this process. Verify that the process is in statistical ...Control chart for x and R are maintained on a process. After 20 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 ...Suppose that following the construction of the x and R control charts in Exercise 6.34, the process engineers decided to change the subgroup size to n = 2. Table 6E.16 contains 10 new subgroups of thickness data. Plot this ...
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