Question: A quality control effort is being undertaken for a process where large steel plates are manufactured and surface defects are of concern. The goal is

A quality control effort is being undertaken for a process where large steel plates are manufactured and surface defects are of concern. The goal is to set up a quality control chart for the number of defects per plate. The data are given below. Set up the appropriate control chart, using this sample information.

Does the process appear to be in control?

223 Sample Number of Defects Sample Number of Defects 1 4 11

223 Sample Number of Defects Sample Number of Defects 1 4 11 1 12 13 14 3 15 1 16 5 17 18 19 20 43213 4 3 2 1 3 213041322 234567810 9

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