The following are the numbers of defective solder joints found during successive samples of 500 solder joints:

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The following are the numbers of defective solder joints found during successive samples of 500 solder joints:


Day No. of Defectives Day No. of Defectives 106 12 37 13 116 25 3 164 14 88 4 89 15 101 99 16 64 40 17 51 112 18 74 71 8


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

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

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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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