雨课堂学堂在线学堂云《Statistics and Introductory Data Analysis( 哈工)》单元测试考核答案

注：不含主观题第1题单选题(1分)Thesummariesofdata,whichmaybetabular,graphical,ornumerical,arereferredtoas()AstatisticalinferenceBdescriptivestatisticsCstatisticalinferenceDreportgeneration第2题单选题(1分)Theproceduresofanalyzingsampledatainordertodrawconclusionsaboutthecharacteristicsofapopulationiscalled()AdescriptivestatisticsBinferentialstatisticsCdataanalysisDdatasummarization第3题单选题(1分)Apopulationis()AthesameasasampleBtheselectionofarandomsampleCthecollectionofallitemsofinterestinaparticularstudyDalwaysthesamesizeasthesample第4题单选题(1分)Celsiustemperatureisanexampleofavariablethatuses()AtheintervalscaleBtheratioscaleCtheordinalscaleDeithertheratioortheordinalscale第5题单选题(1分)Genderisanexampleofa()AqualitativevariableBquantitativevariableCqualitativeorquantitativevariableDNoneofthesealternativesiscorrect.第6题单选题(1分)Incomeisanexampleof()AnominalscaleBordinalscaleCintervalscaleDratioscale第7题判断题(1分)Dataarealwaysbenumeric.()第8题判断题(1分)Aportionofthepopulationselectedtorepresentthepopulationiscalledasample.()第9题判断题(1分)Ordinaryarithmeticoperationsaremeaningfuleitherwithquantitativeorqualitativedata.()第10题判断题(1分)Theordinalscaleofmeasurementhasthepropertiesoftheratioscale.()Chapter2task第1题单选题(1分)Afrequencydistributionis().AatabularsummaryofasetofdatashowingtherelativefrequencyBagraphicalformofrepresentingdataCatabularsummaryofasetofdatashowingthefrequencyofitemsineachofseveralnonoverlappingclassesDagraphicaldeviceforpresentingqualitativedata第2题单选题(1分)Qualitativedatacanbegraphicallyrepresentedbyusinga()AhistogramBfrequencypolygonCogiveDbargraph第3题单选题(1分)Therelativefrequencyofaclassiscomputedby()AdividingthemidpointoftheclassbythesamplesizeBdividingthefrequencyoftheclassbythemidpointCdividingthesamplesizebythefrequencyoftheclassDdividingthefrequencyoftheclassbythesamplesize第4题单选题(1分)Thesumoffrequenciesforallclasseswillalwaysequal()A1BthenumberofelementsinadatasetCthenumberofclassesDavaluebetween0and1第5题单选题(1分)Acumulativerelativefrequencydistributionshows()AtheproportionofdataitemswithvalueslessthanorequaltotheupperlimitofeachclassBtheproportionofdataitemswithvalueslessthanorequaltothelowerlimitofeachclassCthepercentageofdataitemswithvalueslessthanorequaltotheupperlimitofeachclassDthepercentageofdataitemswithvalueslessthanorequaltothelowerlimitofeachclass第6题单选题(1分)Ahistogramis()AagraphicalpresentationofafrequencyorrelativefrequencydistributionBagraphicalmethodofpresentingacumulativefrequencyoracumulativerelativefrequencydistributionCthehistoryofdataelementsDthesameasapiechart第7题判断题(1分)Theobjectiveofconstructingthefrequencydistributionistoprovideinsightsaboutthedatathatcannotbequicklyobtainedbylookingonlyattheoriginaldata.()第8题判断题(1分)Thesumoftherelativefrequenciesforallclasseswillalwaysequalthesamplesize()第9题判断题(1分)Thetotalnumberofdataitemswithavaluelessthantheupperlimitfortheclassisgivenbythecumulativefrequencydistribution.()第10题判断题(1分)Ahistogramissaidtobeskewedtotherightifitstailextendsfarthertotheleft()Chapter3task第1题单选题(1分)Whichofthefollowingprovidesameasureofcentraltendencyforthedata?(

)AstandarddeviationBmeanCvarianceDrange第2题单选题(1分)Ifadatasethasanevennumberofobservations,themedian()AcannotbedeterminedBistheaveragevalueofthetwomiddleitemsCmustbeequaltothemeanDistheaveragevalueofthetwomiddleitemswhenallitemsarearrangedinascendingorder第3题单选题(1分)Whichofthefollowingisameasureofdispersion?()ApercentilesBquartilesCinterquartilerangeDalloftheabovearemeasuresofdispersion第4题单选题(1分)Theinterquartilerangeisusedasameasureofvariabilitytoovercomewhatdifficultyoftherange?()AthesumoftherangevariancesiszeroBtherangeisdifficulttocomputeCtherangeisinfluencedtoomuchbyextremevaluesDtherangeisnegative第5题单选题(1分)Thecoefficientofvariationis()AthesameasthevarianceBtheratioofthestandarddeviationtothemeanCthesquareofthestandarddeviationDthemeandividedbythestandarddeviation第6题单选题(1分)Inafivenumbersummary,whichofthefollowingisnotusedfordatasummarization?()AthesmallestvalueBthelargestvalueCthemeanDthe25thpercentile第7题判断题(1分)Rangeisthemeasureofdispersionthatisinfluencedmostbyextremevalues.()第8题判断题(1分)Whenthedataareskewedtotheright,themeasureofSkewnesswillbenegative.()第9题判断题(1分)Sincethemodeisthemostfrequentlyoccurringdatavalue,itcanneverbelargerthanthemean.()第10题判断题(1分)Thesamplemeanisalwayssmallerthanthemeanofthepopulationfromwhichthesamplewastaken.()Chapter4task第1题单选题(1分)Inbinomialdistribution,if“n”isanumberoftrialsand“p”istheprobabilityofsuccess,thenthemeanvalueisgivenby().AnpBnCpDnp(1-p)第2题单选题(1分)InaBinominalDistribution,ifp,qandnareprobabilityofsuccess,failureandnumberoftrialsrespectivelythenvariancegivenby()AnpBnpqCnp2qDnpq2第3题单选题(1分)Binomialdistributionisa()AContinuousdistributionBDiscretedistributionCIrregulardistributionDNotaprobabilitydistribution第4题单选题(1分)Thescientistin1657publishedthefirstbookonprobabilityentitled

DeRatiociniisinLudoAleaewas(

).AJohnMaynardKeynesBChristianHuygensCAndreiMarkovDPierredeFermat第5题单选题(1分)Assumethatyouhaveabinomialexperimentwithp=0.5andasamplesizeof100.Theexpectedvalueofthisdistributionis()A0.50B0.30C100D50第6题单选题(1分)Theshapeofthenormalcurvedependsonits()AMeandeviationBStandarddeviationCQuartiledeviationDCorrelation第7题判断题(1分)Inabinomialdistribution,themeanandvarianceareequal()第8题判断题(1分)PierredeFermatthroughhiscorrespondencewith

BlaisePascal

wasaco-founderofthetheoryofprobability.()第9题判断题(1分)Theprobabilityofsuccessforabinomialexperiment,denoted

p,isthesameforeachtrial.()第10题判断题(1分)Anormaldistributionwithameanof0andastandarddeviationof1iscalledastandardnormaldistribution.()Chapter5task第1题单选题(1分)Whatdoesthecentrallimittheoremstate?()AifthesamplesizeincreasessamplingdistributionmustapproachnormaldistributionBifthesamplesizedecreasesthenthesampledistributionmustapproachnormaldistributionCifthesamplesizeincreasesthenthesamplingdistributionmuchapproachanexponentialdistributionDifthesamplesizedecreasesthenthesamplingdistributionmuchapproachanexponentialdistribution第2题单选题(1分)Probabilitysamplingmethodsnotinclude(

)AsimplerandomsamplingBsystematicsamplingCstratifiedsamplingDconveniencesampling第3题单选题(1分)Asthesamplesizeincreases,the()AstandarddeviationofthepopulationdecreasesBpopulationmeanincreasesCstandarderrorofthemeandecreasesDstandarderrorofthemeanincreases第4题单选题(1分)Whatisnotcharacterizedclustersampling?()AEachclustershouldbeasmall-scalerepresentationofthetotalpopulation.BTheclustersshouldbemutuallyexclusiveandcollectivelyexhaustiveCArandomsamplingtechniqueisthenusedonanyrelevantclusterstochoosewhichclusterstoincludeinthestudyDInsingle-stageclustersampling,alltheelementsfromeachoftheselectedclustersarenotsampled.第5题单选题(1分)Samplingerroris()Atheresultofusingasubsetofthepopulation(thesample),andnottheentirepopulationBthedifferencebetweenparameterandsampleCtheresultofusingasubsetofthepopulation(thesample),andnottheparameterDthedifferencebetweensampleandparameter第6题单选题(1分)Thesamplinginterval(sometimesknownastheskip):thisiscalculatedas(),wherenisthesamplesize,andNisthepopulationsize.Ak=N*nBk=N/nCk=n/NDk=n/30第7题判断题(1分)Theshapeofthesamplingdistributionofsamplemeanisalwaysnormalwhenthepopulationshapeisnormal()第8题判断题(1分)Theprobabilitydistributionofallpossiblevaluesofthesampleproportionisthe

samplingdistributionofsampleproportion.()第9题判断题(1分)Standarderrorisalwaysnon-negative.(

)第10题判断题(1分)The

centrallimittheoremisatheoremthatgivesusawaytoturnanon-normaldistributionintoanormaldistribution.()Chapter6task第1题单选题(1分)About“Samplemean”and“populationmean”,whichiscorrect?()ATheformerisadefinitevalue,thelatterisarandomvariableBTheformerisarandomvariable,thelatterisadefinitevalueCBotharerandomvariablesDBotharedefinitevalues第2题单选题(1分)100(1-α)%is(

)ASignificantlevelBConfidencelevelCConfidenceIntervalDNoneoftheabove第3题单选题(1分)Parameterestimationcanbedividedinto()APointestimationandunbiasedestimationBUnbiasedestimationandintervalestimation’CPointestimationandefficientestimationDPointestimationandintervalestimation第4题单选题(1分)Theintervalestimationisa()AAbsolutelyreliablerangeBPossiblerangeCAbsolutelyunreliablerangeDImpossiblerange第5题单选题(1分)Under()situation,wecanusetdistributiontoconstructtheconfidenceinterval.

AThepopulationisnormaldistributionandtheisknownBThepopulationisnormaldistributionandtheisunknownCThepopulationisnotnecessarilynormaldistributionDThepopulationisnotnecessarilynormaldistribution,andthetheisknown第6题单选题(1分)AandBaretwounbiasedestimators.IfthevarianceofestimatorAislessthanthatofestimatorB,itiscalledthat()AAismoreefficientthanBBBismoreefficientthanACAismoreconsistentthanBDBismoreconsistentthanA第7题判断题(1分)Whenotherconditionsremainunchanged,thelengthoftheconfidenceintervaldecreaseswhenthesignificantlevelαbecomeslarger.(

)第8题判断题(1分)SupposeX~N(),isknown,ifthesamplesizeandthesignificantlevelkeepunchanged,thenwhenincreases,thelengthoftheconfidenceintervalforthepopulationwillbechanged.(

)第9题判断题(1分)Sampleswiththesizeof4,16and36areextractedfromtheinfinitepopulationsubjecttonormaldistributionrespectively.Whenthesamplesizeincreases,thestandarddeviationofthesamplemeanwillincrease.(

)第10题判断题(1分)Thegeneralformforconfidenceintervalsis“pointestimator±marginoferror”.()Chapter7task第1题单选题(1分)Nullandalternativehypothesesarestatementsabout()Apopulationparameters.Bsampleparameters.Csamplestatistics.Ditdepends-sometimespopulationparametersandsometimessamplestatistics.第2题单选题(1分)Aresultiscalled“statisticallysignificant”whenever(

)AThenullhypothesisistrue.BThealternativehypothesisistrue.CThep-valueislessorequaltothesignificancelevel.DThep-valueislargerthanthesignificancelevel.第3题单选题(1分)Whichofthefollowingisnotacorrectwaytostateanullhypothesis?()A:B:C:D:p=0.5第4题单选题