# Question

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 Questions

What 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 ...Post your question

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