Guide to Quality Control |
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abnormality Ac Re Ac action bar graph Base panel breaks basis binomial probability paper cause cause-and-effect diagram chapter check sheet collecting data Condenser control limit lines control lines correlation data sheet defective items determine dispersion Electronics subsidiary enamel wire example factory fraction defective frequency distribution table HH HH HH histogram Improper rotation improvement increments inspection level Kaoru Ishikawa line graph Lower control limit machine mean value measurement median line method moisture content Neon tube normal inspection number of defectives number of points obtained P₁ Pareto diagram pie charts Pilot lamp plot pn chart production process Purchasing section QC Circle quality control random sampling relationship scatter diagram shown in figure shows single sampling inspection Six-spool trimmer standard deviation Step stratified Sub-group number total number Upper control limit Vacuum tube vertical axis wobble workers x-R control charts