The copper content of a plating bath is measured three times per day, and the results are
Question:
(a) Using all the data, find trial control limits for XÌ and R charts, construct the chart, and plot the data. Is the process in statistical control?
(b) If necessary, revise the control limits computed in part (a), assuming that any samples that plot outside the control limits can be eliminated.
Transcribed Image Text:
Day Day 1.21 1 5.45 14 7.01 1.45 0.95 1.37 5.39 15 5.83 3 6.85 1.43 16 6.35 1.04 6.74 1.29 17 6.05 0.83 5 5.83 1.35 18 7.11 1.35 7.22 1.09 0.88 19 7.32 6.39 0.92 20 5.90 1.22 8. 6.50 1.13 21 5.50 0.98 1.25 22 9. 7.15 6.32 1.21 6.55 0.76 10 5.92 1.05 23 11 6.45 0.98 24 5.90 1.20 5.95 1.19 12 5.38 1.36 25 13 6.03 0.83
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a There are no points beyond the control limits The process appears to be in control b No ...View the full answer
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Related Book For
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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