《Business statistic》复习参考第一章至第八章Word文件下载.docx

《Business statistic》复习参考第一章至第八章Word文件下载.docx

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2、DescriptiveStatistics：

Thesearestatisticalmethodsoforganizing,summarizingandpresentingnumericaldatainconvenientformssuchasgraphs,chartsandtables.

3、Inferentialstatisticsisdefinedasstatisticalmethodsusedfordrawingconclusionsaboutapopulationbasedonsamples.

4、Primarydataisobtainedfirsthand.

5、Secondarydataalreadyexistsorhasbeenpreviouslycollectedsuchascompanyaccounts,orsalesfigures.

6、Mean:

Thearithmeticaverageandthemostcommonmeasureofaaaaaaacentraltendency.①Allvaluesareincludedincomputingthemean.②Asetofdatahasauniquemean③Themeanisaffectedbyunusuallylargeorsmalldatapoints（outliers/extremevalues）.

7、Mode:

Themostfrequentdata,ordatacorrespondingtothehighestfrequency.①Modeisnotaffectedbyextremevalues.②Theremaynotbeamode.③Theremaybeseveralmodes.④Usedforeithernumericalorcategoricaldata.

8、Medianisthevaluethatsplitsarankedsetofdataintotwoequalparts.①Medianisnotaffectedbyextremelylargeorsmallvaluesandisthereforeavaluablemeasureofcentraltendencywhensuchvaluesoccur.

9、StandardDeviation:

①Ameasureofthevariationofdatafromthemean.②Themostcommonlyusedmeasureofvariation.③Representedbythesymbol‘s’.④Showshowthedataisdistributedaroundthemean.

10、Probabilityisthechanceofanoccurrenceofanevent.①Probabilityofaneventalwaysliesbetween0and1.②Thesumoftheprobabilitiesofeverypossibleoutcomeoreventis1.③TheprobabilityofthecomplementA’isgivenby1-P（A）.

11、PropertiesofNormaldistribution：

①Continuousrandomvariable.②‘Bell-shaped’&

symmetrical.③Mean,median,modeareequal④Areaunderthecurveis1.

12、TheCentralLimitedTheorem：

①Ifthepopulationfollowednormaldistribution,thesamplingdistributionofmeanisfollowednormaldistribution.②Ifthepopulationdonotfollowednormaldistribution,butthesamplesizeislargerthan30,thesamplingdistributionofmeanisfollowednormaldistribution.

Part2选择题

Topic1-IntroductiontoBusinessStatistics&

DataCollection

Q1.Theuniverseortotalityofitemsorthingsunderconsiderationiscalled:

a.asample.

b.apopulation.

c.aparameter.

d.noneoftheabove.

Q2.Thosemethodsinvolvingthecollection,presentation,andcharacterizationofasetofdatainordertoproperlydescribethevariousfeaturesofthatsetofdataarecalled:

a.inferentialstatistics.

b.totalqualitymanagement.

c.sampling.

d.descriptivestatistics.

Q3.Theportionoftheuniversethathasbeenselectedforanalysisiscalled:

b.aframe.

d.astatistic.

Q4.Asummarymeasurethatiscomputedtodescribeanumericalcharacteristicfromonlyasampleofthepopulationiscalled:

a.aparameter.

b.acensus.

c.astatistic.

d.thescientificmethod.

Q5.Asummarymeasurethatiscomputedtodescribeacharacteristicofanentirepopulationiscalled:

d.totalqualitymanagement.

Q6.Theprocessofusingsamplestatisticstodrawconclusionsaboutpopulationparametersiscalled:

b.experimentation.

c.primarysources.

Q7.Whichofthefourmethodsofdatacollectionisinvolvedwhenapersonretrievesdatafromanonlinedatabase

a.publishedsources.

c.surveying.

d.observation.

Q8.Whichofthefourmethodsofdatacollectionisinvolvedwhenpeopleareaskedtocompleteaquestionnaire

Q9.WhichofthefourmethodsofdatacollectionisinvolvedwhenapersonrecordstheuseoftheLosAngelesfreewaysystem

Q10.Afocusgroupisanexampleofwhichofthefourmethodsofdatacollection

Q11.Whichofthefollowingistrueaboutresponserates

a.Thelongerthequestionnaire,thelowertherate.

b.Mailsurveysusuallyproducelowerresponseratesthanpersonalinterviewsortelephonesurveys.

c.Questionwordingcanaffectaresponserate.

d.d.Alloftheabove.

Q12.Whichofthefollowingisareasonthatamanagerneedstoknowaboutstatistics

a.Toknowhowtoproperlypresentanddescribeinformation.

b.Toknowhowtodrawconclusionsaboutthepopulationbasedonsampleinformation.

c.Toknowhowtoimproveprocesses.

d.Alloftheabove.

Scenario1-1

Questions13-15refertothisscenario:

Aninsurancecompanyevaluatesmanyvariablesaboutapersonbeforedecidingonana