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abnormality action actual survey points actual survey triangle axle bar graph basis beads binomial probability paper cause-and-effect diagram causes cent defective changes chapter check sheet collecting data column Compute Condenser control chart control limit lines control lines correlation data sheet defective items determine dispersion effect example factory fraction defective frequency distribution table histogram improper rotation improvement inspection level Kaoru Ishikawa Lower control limit machine mean value measurement median line moisture content necessary normal inspection number of data number of defectives number of points obtained Pareto diagram percentage pie charts plotted practice problems production process Purchasing section QC Circle quality characteristics quality control random sampling reduced inspection rejected relationship represent scale scatter diagram shown in figure shows single sampling inspection standard deviation Step stratified total number Upper control limit uu uu uu Vacuum tube vertical axis workers x-R control charts