商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap013.ppt

商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap013.ppt

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商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap013.ppt_第1頁(yè)
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1、COMPLETE BUSINESS STATISTICSbyAMIRD.ACZEL&JAYAVELSOUNDERPANDIAN6thedition.Chapter13QualityControlandImprovementsUsingStatisticsW.EdwardsDemingInstructsStatisticsandQualityThex-barChartTheRChartandthesChartThepChartThecChartThexChartQualityControlandImprovements13Determinewhentouse

2、controlchartsCreatecontrolchartsforsamplemeans,rangesandstandarddeviationsCreatecontrolchartsforsampleproportionsCreatecontrolchartsforthenumberofdefectivesDrawParetochartsusingspreadsheettemplatesDrawcontrolchartsusingspreadsheettemplatesLEARNINGOBJECTIVES13Afterstudyingthischapt

3、eryouwillbeableto:Acontrolchartisatimeplotofastatistic,suchasasamplemean,range,standarddeviation,orproportion,withacenterlineandupperandlowercontrollimits.Thelimitsgivethedesiredrangeofvaluesforthestatistic.Whenthestatisticisoutsidethebounds,orwhenitstimeplotrevealscertainpatterns

4、,theprocessmaybeoutofcontrol.Aprocessisconsideredinstatisticalcontrolifithasnoassignablecauses,onlynaturalvariation.UCLLCLCenterLineTimeValueThispointisoutofthecontrollimits3?3?13-3StatisticsandQualityValueTimeValueTimeProcessisincontrolProcessmeanvariesovertime: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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