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ID:51528984
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时间:2020-03-22
《商务统计全套配套课件[美]AmirD.AczelJayavelSounderpandian著谭英平等译Chap013.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、COMPLETEBUSINESSSTATISTICSbyAMIRD.ACZEL&JAYAVELSOUNDERPANDIAN6thedition.Chapter13QualityControlandImprovementsUsingStatisticsW.EdwardsDemingInstructsStatisticsandQualityThex-barChartTheRChartandthesChartThepChartThecChartThexChartQualityControlandImprovements13Determinewhentouse
2、controlchartsCreatecontrolchartsforsamplemeans,rangesandstandarddeviationsCreatecontrolchartsforsampleproportionsCreatecontrolchartsforthenumberofdefectivesDrawParetochartsusingspreadsheettemplatesDrawcontrolchartsusingspreadsheettemplatesLEARNINGOBJECTIVES13Afterstudyingthischapt
3、eryouwillbeableto:Acontrolchartisatimeplotofastatistic,suchasasamplemean,range,standarddeviation,orproportion,withacenterlineandupperandlowercontrollimits.Thelimitsgivethedesiredrangeofvaluesforthestatistic.Whenthestatisticisoutsidethebounds,orwhenitstimeplotrevealscertainpatterns
4、,theprocessmaybeoutofcontrol.Aprocessisconsideredinstatisticalcontrolifithasnoassignablecauses,onlynaturalvariation.UCLLCLCenterLineTimeValueThispointisoutofthecontrollimits3313-3StatisticsandQualityValueTimeValueTimeProcessisincontrolProcessmeanvariesovertime:processisoutofcont
5、rolControlChartsControlCharts(Continued)TimeValueProcessvariancechangesovertime:processisoutofcontrol.TimeValueProcessmeanandvariancechangeovertime:processisoutofcontrol.AParetodiagramisabarchartofthevariousproblemsinproductionandtheirpercentages,whichmustaddto100%.ParetoDiagrams–
6、UsingtheTemplateAParetocharthelpstoidentifythemostsignificantproblemsandthusonecanconcentrateontheirsolutionsratherthanwastetimeandresourcesonunimportantcauses.Finishedproductsaregroupedinlotsbeforebeingshippedtocustomers.Thelotsarenumbered,andrandomsamplesfromtheselotsareinspecte
7、dforquality.Suchchecksaremadebeforethelotsareshippedandafterthelotsarriveattheirdestination.TherandomsamplesaremeasuredtofindoutwhichandhowmanyitemsdonotmeetspecificationsAlotisrejectedwheneverthesamplemeanexceedsorfallsbelowsomepre-specifiedlimit.AcceptanceSamplingForattributedat
8、a,thelotisrejectedwhenthenumberof
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