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the f1ve bas1c stages of qual1ty control
the cost of qual1ty and 1ts effect upon
the qual1ty of des1gn
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100 per cent accepted accuracy and precision achieve assembly attributes average chart batch containing cent defectives cent inspection Chapter components correct cumulative frequency decide defective pieces discussed in section drawing limits drift ensure equipment example factory fault faulty piece final inspection first-off frequency distribution curve frequency of inspection grand average incoming inspection inner control limits inspector machine or process manufacture mean range number of defectives operating characteristic operator control out-of-limit outer control limits Outer limit Pareto analysis patrol inspection percentage of defectives plot possible practice probability process capability production lines production run quality control chart quality control system quality engineer quality of design quality schedule quality standard range chart rejected sample of five sample size sampling plan satisfactory scrap shown in Fig specification limits specification or drawing standard deviation supervisor supplier Suppose take a sample usually variability