Reconsider the data from Exercise 6.42 and establish x and R charts with appropriate trial control limits.
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(a) Plot these new observations on the control chart. What conclusions can you draw about process stability?
(b) Use all 25 observations to revise the control limits for the x and R charts. What conclusions can you draw now about the process?
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a Answer Continue Next Page We are trying to establish trial control limits from the first 15 sample...View the full answer
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Related Book For 
Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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