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