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1、COMPLETEBUSINESSSTATISTICSbyAMIRD.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-ObservationComparisonsofMeansArandomsampleof16viewersofHomeShoppingNetworkwasselectedforanexperiment.Allviewersinthesamplehadrecordedtheamountof
7、moneytheyspentshoppingduringtheholidayseasonofthepreviousyear.Thenextyear,thesepeopleweregivenaccesstothecablenetworkandwereaskedtokeeparecordoftheirtotalpurchasesduringtheholidayseason.HomeShoppingNetworkmanagerswanttotestthenullhypothesisthattheirservicedoesnotincrea
8、seshoppingvolume,versusthealternativehypothesisthatitdoes.ShopperPreviousCurrentDiff1334405712150125-2535205402049510