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Economics of Quality Control
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accepted action limits AOQL Appendix application arithmetic mean assurance average and standard average outgoing lot average strength Bell Telephone Laboratory bolts cell interval cell limits chance Chapter charts classification considered correct cost determine economical engineering equation estimate factors formula frequency distribution ft ft functions grand average incoming material individual inspec inspector large number large samples limits for sample lot quality protection Lot Tolerance Percent machine manufacturing mid-point normal curve normal distribution number of defectives obtained outgoing lot quality personnel plant Poisson distribution practical problem procedure process control quality control quality department quality-control department rework rivets sample averages sample mean sample results sample size sample standard deviation sampling inspection shear strength sheet shown in Figure significant difference small samples specifications spot welding standard error statistical methods steel stock samples Table tion tolerance percent defective universe standard deviation universe value variation