商业分析基础week 4 lecture slides四周讲座.pptx

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商业分析基础week 4 lecture slides四周讲座.pptx

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GSBS6002

FoundationsofBusinessAnalysis

Trimester3,2015Week4–SamplingDesignsandProceduresChapter16MdLutfurRahmanCourseCoordinator1

Chapter16

SamplingDesignsandProcedures2

ExplainreasonsfortakingasampleratherthanacompletecensusDescribetheprocessofidentifyingatargetpopulationandselectingasamplingframeComparerandomsamplingandsystematic(nonsampling)errorsIdentifythetypesofprobabilityandnonprobabilitysampling,includingtheiradvantagesanddisadvantagesDiscusshowtochooseanappropriatesampledesign,aswellaschallengesforInternetsampling16-3

16–4SamplingTerminologyPopulation(universe)Anycompletegroupofentitiesthatsharesomecommonsetofcharacteristics.PopulationElementAnindividualmemberofapopulation.CensusAninvestigationofalltheindividualelementsthatmakeupapopulation.SampleAsubset,orsomepart,ofalargerpopulation.

16–5WhySample?PragmaticReasonsBudgetandtimeconstraints.Limitedaccesstototalpopulation.AccurateandReliableResultsSamplescanyieldreasonablyaccurateinformation.Strongsimilaritiesinpopulationelementsmakessamplingpossible.Samplingmaybemoreaccuratethanacensus.DestructionofTestUnitsSamplingreducesthecostsofresearchinfinitepopulations.

EXHIBIT16.1 StagesintheSelectionofaSample16–6

16–7PracticalSamplingConceptsDefiningtheTargetPopulationWhatistherelevantpopulation?Whomdowewanttotalkto?Populationisoperationallydefinedbyspecificandexplicittangiblecharacteristics.TheSamplingFrameAlistofelementsfromwhichasamplemaybedrawn;alsocalledworkingpopulation.SamplingFrameErrorOccurswhencertainsampleelementsarenotlistedorarenotaccuratelyrepresentedinasamplingframe.

16–8PracticalSamplingConcepts(cont’d)Samplingservices(listbrokers)Providelistsordatabasesofthenames,addresses,phonenumbers,ande-mailaddressesofspecificpopulations.ReversedirectoryAdirectorysimilarto