A manufacturer inspected 40 circuit boards and found a total of 640 defects. If the company wants to use statistical process control (SPC) to control the manufacturing process by monitoring the number of defects per circuit board, what type of chart should they use and what should be the control limits?
The correct chart to use is a c-chart. The average number of defects/unit = c-bar = 640/40 = 16 . Therefore the control limits are
LCL = 16 - 3 (sq. root of (16)) = 4
UCL = 16 + 3 (sq. root of (16)) = 28
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