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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Assume normality and that there has been a 1.6σx increase in the process mean. If
-chart limits were computed using known parameter values:
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(a) How many points would we expect to have to plot on the X-chart before observing one that is above the UCL?
(b) If an
-chart with subgroups of size n = 4 were used instead of an
-chart, how many points would we expect to observe before seeing a point above the UCL on the X-chart?
(c) Compare your answers and explain why your answer to part (b) is smaller than your answer to part (a).
(d) Are your answers to (a) and (b) parameter-change ARLs or not? Explain.
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