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abnormality action actual survey points actual survey triangle analyze bar graph basis beads binomial probability paper cause-and-effect diagram causes cent defective changes chapter check sheet collecting data column control chart control limit lines control lines correlation data sheet defective items determine dispersion draw effect example factory fraction defective frequency distribution table HH HH HH histogram horizontal axis improper rotation improvement increments inspection level Kaoru Ishikawa Letos 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 purpose 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 Sub-group number total number Upper control limit vertical axis workers x-R control charts