商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap005.ppt

商務(wù)統(tǒng)計(jì)全套配套課件[美]AmirD.AczelJayavelSounderpandian著譚英平等譯Chap005.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Chap005.ppt_第1頁(yè)
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1、COMPLETE BUSINESS STATISTICSbyAMIRD.ACZEL&JAYAVELSOUNDERPANDIAN6thedition.Chapter5SamplingandSamplingDistributionsUsingStatisticsSampleStatisticsasEstimatorsofPopulationParametersSamplingDistributionsEstimatorsandTheirPropertiesDegreesofFreedomTheTemplateSamplingandSamplingDistri

2、butions5TakerandomsamplesfrompopulationsDistinguishbetweenpopulationparametersandsamplestatisticsApplythecentrallimittheoremDerivesamplingdistributionsofsamplemeansandproportionsExplainwhysamplestatisticsaregoodestimatorsofpopulationparametersJudgeoneestimatorasbetterthananotherb

3、asedondesirablepropertiesofestimatorsApplytheconceptofdegreesoffreedomIdentifyspecialsamplingmethodsComputesamplingdistributionsandrelatedresultsusingtemplatesLEARNINGOBJECTIVES5Afterstudyingthischapteryoushouldbeableto:StatisticalInference:Predictandforecastvaluesofpopulationpar

4、ameters...Testhypothesesaboutvaluesofpopulationparameters...Makedecisions...OnbasisofsamplestatisticsderivedfromlimitedandincompletesampleinformationMakegeneralizationsaboutthecharacteristicsofapopulation...Onthebasisofobservationsofasample,apartofapopulation5-1UsingStatisticsDem

5、ocratsRepublicansPeoplewhohavephonesand/orcarsand/orareDigestreaders.BiasedSamplePopulationDemocratsRepublicansUnbiasedSamplePopulationUnbiased,representativesampledrawnatrandomfromtheentirepopulation.Biased,unrepresentativesampledrawnfrompeoplewhohavecarsand/ortelephonesand/orre

6、adtheDigest.TheLiteraryDigestPoll(1936)Anestimatorofapopulationparameterisasamplestatisticusedtoestimateorpredictthepopulationparameter.Anestimateofaparameterisaparticularnumericalvalueofasamplestatisticobtainedthroughsampling.Apointestimateisasinglevalueusedasanestimateofapopula

7、tionparameter.Apopulationparameterisanumericalmeasureofasummarycharacteristicofapopulation.5-2SampleStatisticsasEstimatorsofPopulationParametersAsamplestatisticisanumericalmeasureofasummarycharacteristicofasample.Thesamplemean,,isthemostcommonestimatorofthepopulationmean,??Thesam

8、plevariance,s2,isthemostcommonestimatoro

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