The following are the number of defects observed on 15 samples of transmission units in an automotive

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The following are the number of defects observed on 15 samples of transmission units in an automotive manufacturing company. Each lot contains five transmission units.

(a) Using all the data, compute trial control limits for a U control chart, construct the chart, and plot the data.

(b) Determine whether the process is in statistical control. If not, assume assignable causes can be found and out-of-control points eliminated. Revise the control limits.


No. of Defects Sample No. of Defects Sample 1 11 10 12 10 3 24 13 11 4 6. 14 17 5 5 15 21 10 8. 9. 10 15

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Applied Statistics And Probability For Engineers

ISBN: 9781118539712

6th Edition

Authors: Douglas C. Montgomery, George C. Runger

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