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abnormality action actual survey points actual survey triangle analyze bar graph basis binomial probability paper broken line graphs cause-and-effect diagram cent defective changes chapter check sheet Coil plant collecting data Condenser control chart control limit lines control lines correlation data sheet defective items determine difﬁcult dispersion example factory Figure ﬁnd ﬁrst ﬁve fraction defective frequency distribution table histogram horizontal axis improper rotation improvement inspection level Kaoru Ishikawa machine mean value measurement median line method moisture content normal inspection number of data number of defectives number of points obtained Pareto diagram pie charts plotted production process Purchasing section QC Circle quality control random sampling reduced inspection relationship represent scale scatter diagram shown in ﬁgure shows signiﬁcance single sampling inspection standard deviation Step stratiﬁed stratify sub group sufﬁcient total number Vacuum tube vertical axis workers