The following represent the number of solder defects observed on 24 samples of five printed circuit boards:

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7, 6, 8, 10, 24, 6, 5, 4, 8, 11, 15, 8, 4, 16, 11, 12, 8, 6, 5, 9, 7, 14, 8, 21.

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

(b) Can we conclude that the process is in control using a U chart? If not, assume that assignable causes can be found, and list points and 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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Question Posted: Jul 10, 2018 05:33 AM

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The following represent the number of solder defects observed on 24 samples of five printed circuit boards:

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a Samples 5 and 24 are points beyond the control limits The limit...View the full answer

Applied Statistics And Probability For Engineers

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