chapter6Ssolutions

chapter6Ssolutions - SUPPLEMENT 6 DISCUSSION QUESTIONS 2....

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SUPPLEMENT 6 DISCUSSION QUESTIONS 2. The ultimate goal of the X and R -charts is to ascertain, by a sampling procedure, that the relevant parameter is kept within specific upper and lower bounds. The X bar chart alone tells us only that the average or variable values are within the appropriate limits. The combination of X and the R - charts allows one to determine that both the average and the deviations are within the limits. 4. A process can be out of control because of assignable variation, which can be traced to specific causes. Examples include such factors as: n Tool wear n A change in raw materials n A change in working environment (temperature or humidity, for example) n Tired or poorly trained labor 6. Natural variations are those variations that are inherent in the process and for which there is no identifiable cause. These variations fall in a natural pattern. Assignable causes are variations beyond those that can be expected to occur because of natural variation. These variations can be traced to a specific cause. 11.
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This note was uploaded on 02/15/2012 for the course BA 252 taught by Professor Jamescampbell during the Winter '03 term at UMSL.

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chapter6Ssolutions - SUPPLEMENT 6 DISCUSSION QUESTIONS 2....

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