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A CNC lathe is used to cut shafts with diameter 1

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A CNC lathe is used to cut shafts with diameter 1.500 inches. An IE engineer needs to develop control charts
for SPC. 20 samples with sample size 4 were taken to get X = 1.502, R = 0.300. Develop the control charts or
give the control limits of the control charts for sample average x, and range R?