商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap008.ppt

商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap008.ppt

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1、COMPLETE BUSINESS STATISTICSbyAMIRD.ACZEL&JAYAVELSOUNDERPANDIAN6thedition.Chapter8TheComparisonofTwoPopulationsUsingStatisticsPaired-ObservationComparisonsATestfortheDifferencebetweenTwoPopulationMeansUsingIndependentRandomSamplesALarge-SampleTestfortheDifferencebetwee

2、nTwoPopulationProportionsTheFDistributionandaTestfortheEqualityofTwoPopulationVariancesTheComparisonofTwoPopulations8ExplaintheneedtocomparetwopopulationparametersConductapaireddifferencetestforthedifferenceinpopulationmeansConductanindependentsamplestestforthedifferen

3、ceinpopulationmeansDescribewhyapaireddifferencetestisbetterthanindependentsamplestestConductatestfordifferenceinpopulationproportionsTestwhethertwopopulationvariancesareequalUsetemplatestocarryoutalltestsLEARNINGOBJECTIVES8Afterstudyingthischapteryoushouldbeableto:Infe

4、rencesaboutdifferencesbetweenparametersoftwopopulationsPaired-ObservationsObservethesamegroupofpersonsorthingsAttwodifferenttimes:“before”and“after”Undertwodifferentsetsofcircumstancesor“treatments”IndependentSamplesObservedifferentgroupsofpersonsorthingsAtdifferenttim

5、esorunderdifferentsetsofcircumstances8-1UsingStatisticsPopulationparametersmaydifferattwodifferenttimesorundertwodifferentsetsofcircumstancesortreatmentsbecause:ThecircumstancesdifferbetweentimesortreatmentsThepeopleorthingsinthedifferentgroupsarethemselvesdifferentByl

6、ookingatpaired-observations,weareabletominimizethe“betweengroup”,extraneousvariation.8-2Paired-ObservationComparisonsPaired-ObservationComparisons ofMeansArandomsampleof16viewersofHomeShoppingNetworkwasselectedforanexperiment.Allviewersinthesamplehadrecordedtheamountof

7、moneytheyspentshoppingduringtheholidayseasonofthepreviousyear.Thenextyear,thesepeopleweregivenaccesstothecablenetworkandwereaskedtokeeparecordoftheirtotalpurchasesduringtheholidayseason.HomeShoppingNetworkmanagerswanttotestthenullhypothesisthattheirservicedoesnotincrea

8、seshoppingvolume,versusthealternativehypothesisthatitdoes.ShopperPreviousCurrentDiff1334405712150125-2535205402049510

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