商务统计冬学期 知到智慧树网课答案

商务统计冬学期-知到答案、智慧树答案绪论单元测试1、问题：PennyBauer,ChiefFinancialOfficerofHarrisonHaulage,suspectsirregularitiesinthepayrollsystem,andordersaninspectionof‘eachandeverypayrollvoucherissuedsince1January2005’.Fiveperc选项：A:descriptivestatisticsB:nominaldataC:nonparametricstatisticsD:inferentialstatistics答案:【descriptivestatistics】第一章单元测试1、问题：MichaelBayley,MarketingDirectorofUniPower’sElectricalDivision,isleadingastudytoidentifyandassesstherelativeimportanceofproductfeatures.Michaeldirectshisstafftodesignasurveyques选项：A:populationB:sampleC:parameterD:statistic答案:【population】2、问题：ClaudiaTaylor,DirectorofGlobalIndustrialSalesinMelbourne,isconcernedbyadeterioratingsalestrend.Specifically,thenumberofcustomersisstableat1500buttheyarepurchasinglesseachyear.S选项：A:populationB:statisticC:sampleD:parameter答案:【sample】3、问题：Apoliticianwhoisrunningfortheofficeofpremierinastatewith3millionregisteredvoterscommissionsasurvey.Inthesurvey,53.6%ofthe5000registeredvotersinterviewedsaytheyplantovoteforhim选项：A:53.6%of,or2680,votersinterviewedwhoplantovoteforhimB:5000registeredvotersinterviewed.C:46.4%of,or2320,votersinterviewedwhoplannottovoteforhimD:3millionregisteredvotersinthestate.答案:【3millionregisteredvotersinthestate.】4、问题：SimonArnett,DirectorofHumanResources,isexploringthecausesofemployeeabsenteeismatBuderimBottlingduringthelastoperatingyear(1January2005to31December2005).Theaveragenum选项：A:sampleB:populationC:statisticD:parameter答案:【parameter】5、问题：Asummarymeasurethatiscomputedfromasampletodescribeacharacteristicofthepopulationiscalled选项：A:aparameterB:apopulationC:BothAandCarecorrect,sincetheyarethesameD:astatistic答案:【astatistic】6、问题：SimonArnett,DirectorofHumanResources,isexploringthecausesofemployeeabsenteeismatBuderimBottlingduringthelastoperatingyear(1January2005to31December2005).Personnelrecord(Theplantemploys250.)Forthisstudy,theaveragenumberdaysabsentforthese50employeesisa________________.选项：A:populationB:statisticC:sampleD:parameter答案:【statistic】7、问题：Descriptivestatisticsdealswithmethodsof选项：A:presentingdatainaconvenientandinformativewayB:summarisingdataC:doingalloftheaboveD:organisingdata.答案:【doingalloftheabove】8、问题：Whichofthefollowingstatementsisnottrue?选项：A:StatisticalinferenceisusedtodrawconclusionsorinferencesaboutcharacteristicsofpopulationsbasedonsampledataB:Inthelanguageofstatistics,thetermpopulationreferstoagroupofpeopleC:OneformofdescriptivestatisticsusesgraphicaltechniquesD:Oneformofdescriptivestatisticsusesnumericaltechniques答案:【Inthelanguageofstatistics,thetermpopulationreferstoagroupofpeople】9、问题：Astudentachievesan82onthefirsttestinastatisticscourse.Fromthis,sheassumesthatheraverageattheendofthesemester(afterothertests)willbeabout82.Thisisanexampleof__________________选项：A:nonparametricstatisticsB:wishfulthinkingC:descriptivestatisticsD:inferentialstatistics答案:【inferentialstatistics】10、问题：Whichofthefollowingisnotthegoalofdescriptivestatistics?选项：A:ReportingnumericalfindingsB:DisplayingaspectsofthecollecteddataC:EstimatingcharacteristicsofthepopulationD:Summarisingdata答案:【Estimatingcharacteristicsofthepopulation】第二章单元测试1、问题：Ifdataaregroupedintointervalsandthenumberofitemsineachgroupislisted,thiscouldbecalleda_______________.选项：A:histogramB:ogiveC:frequencydistributionD:stemandleafplot答案:【histogram】2、问题：Iftheindividualclassfrequencyisdividedbythetotalfrequency,theresultisthe__________.选项：A:midpointfrequencyB:stemandleafplotC:cumulativefrequencyD:relativefrequency答案:【relativefrequency】3、问题：Acumulativefrequencypolygonisalsocalled_______________.选项：A:afrequencypolygonB:astemandleafplotC:anogiveD:ahistogram答案:【anogive】4、问题：Thenumberofclassintervalsinafrequencydistributionisusuallybetween___________.选项：A:5and15B:3and5C:1and25D:7and9答案:【5and15】5、问题：Oneadvantageofastemandleafplotoverafrequencydistributionisthat__________.选项：A:theclassmidpointsareusedastheleafB:itcontainsmoreclassintervalsC:thevaluesoftheoriginaldataareretainedD:theclassmidpointsareusedasthestem答案:【thevaluesoftheoriginaldataareretained】6、问题：Onerulethatmustalwaysbefollowedinconstructingfrequencydistributionsisthat________.选项：A:thenumberofintervalsmustbeanoddnumberB:thenumberofclassesmustbelessthan10C:thewidthofeachclassisequaltotherangeD:eachdatapointcanonlyfallintooneclass答案:【eachdatapointcanonlyfallintooneclass】7、问题：Whichofthefollowingisbesttoshowthepercentageofatotalbudgetthatisspentoneachcategoryofitems?选项：A:histogramB:piechartC:ogiveD:stemandleafchart答案:【piechart】8、问题：Acumulativefrequencydistributionwouldprovide_____________.选项：A:agraphofafrequencydistributionB:theproportionofthetotalfrequencieswhichfallintoeachclassC:arunningtotalofthefrequenciesintheclassesD:averycloudypictureofthefrequencies答案:【arunningtotalofthefrequenciesintheclasses】9、问题：Thenumberofphonecallsarrivingataswitchboardeachhourhasbeenrecordedandthefollowingfrequencydistributionhasbeendeveloped.ClassIntervalFrequency20-under403040-under604560-under808080-under10045Whatisthecumulativefrequencyofthethirdclass?选项：A:0.40B:75C:80D:155答案:【155】10、问题：Thenumberofphonecallsarrivingataswitchboardeachhourhasbeenrecordedandthefollowingfrequencydistributionhasbeendeveloped.ClassIntervalFrequency20-under403040-under604560-under808080-under10045Whatistheapproximaterangeofthenumberofphonecallsarrivingeachhour?选项：A:100B:200C:80D:20答案:【80】第三章单元测试1、问题：SimonArnett,DirectorofHumanResources,isexploringemployeeabsenteeismattheBuderimBottlingduringthelastoperatingyear.Asampleofsixpersonnelrecordsproducedthefollowingdata:0,2选项：A:3.41C:9.67答案:【】2、问题：JessicaSalas,ManagingDirectorofSalasProducts,isreviewingthewarrantypolicyforhercompany’snewmodelofcarbatteries.Lifetestsperformedonasampleof100batteriesindicated:(1)anaveragelifeof75months,(2)astandarddeviationof5months,and(3)batterylifeisapproximatelynormallydistributed.Approximately68%ofthebatterieswilllastbetween________________.选项：A:70and80monthsB:60and90monthsC:55and95monthsD:65and85months答案:【70and80months】3、问题：Theaveragestartingsalaryforgraduatesatauniversityis$25,000withastandarddeviationof$2000.AhistogramofthedatashowstheshapetobeveryerraticsoChebyshev’sTheoremshouldbeused.Ho选项：A:atleast89%B:atleast95%C:atleast68%D:atleast75%答案:【atleast75%】4、问题：Thesamplestandarddeviationisfoundbytakingthesquarerootof_______.选项：A:thesamplevarianceB:thesamplemeanC:themeanabsolutedeviationD:thecoefficientofvariation答案:【thesamplevariance】5、问题：Thenumberofstandarddeviationsthatavalue(X)isaboveorbelowthemeanisthe_______.选项：A:interquartilerangeB:ZscoreC:absolutedeviationD:coefficientofvariation答案:【Zscore】6、问题：Inahistogram,theproportionofthetotalareathatmustbetotheleftofthemedianis（）选项：A:lessthan0.50ifthedistributionisskewedtotheleftB:exactly0.50.C:morethan0.50ifthedistributionisskewedtotherightD:between0.25and0.60ifthedistributionissymmetricandunimodal答案:【exactly0.50.】7、问题：WhichofthefollowingisNOTameasureofcentraltendency?选项：A:varianceB:meanC:modeD:median答案:【variance】8、问题：Anothertermforaverageis____________.选项：A:medianB:meanC:modeD:variance答案:【mean】9、问题：Ifthemeanofadistributionisgreaterthanthemedian,thenthedistributionis____________.选项：A:skewedtotheleftB:skewedtotherightC:notskewedD:symmetricalaboutitsmean答案:【skewedtotheright】10、问题：Themeanisnotaffectedbytheextremevalues.选项：A:错B:对答案:【错】第四章单元测试1、问题：Aprocessthatproducesoutcomesiscalled_______.选项：A:anexperimentB:populationequivalentC:aneventD:aresult答案:【anexperiment】2、问题：WhichofthefollowingisNOTalegitimateprobabilityvalue?选项：A:0.23B:15/16C:0.67D:4/3答案:【4/3】3、问题：Anoutcomeofanexperimentiscalled_______.选项：A:apriorielementsB:acomplementC:aneventD:aprobability答案:【anevent】4、问题：Thelistofallelementaryeventsforanexperimentiscalled_______.选项：A:theexhaustivelistB:thesamplespaceC:thepopulationspaceD:theeventunion答案:【thesamplespace】5、问题：IfAandBaremutuallyexclusiveeventswithP(A)=0.70,thenP(B)：（）选项：A:cannotbelargerthan0.30B:cantakeanyvaluebetween0and1C:cannotbedeterminedfromtheinformationgivenD:cantakeanyvaluebetween0and0.70答案:【cannotbelargerthan0.30】6、问题：IfaneventisinsetXbutisnotinsetY,whichofthefollowingistrue?选项：A:itisinboththeunionandintersectionofXandYB:itisnotintheunionofXandYC:itisintheunionofXandYD:itisintheintersectionofXandY答案:【itisintheunionofXandY】7、问题：Iftheoccurrenceofoneeventdoesnotaffecttheoccurrenceofanotherevent,thenthetwoeventsare_______.选项：A:mutuallyexclusiveB:complementsC:independentD:elementaryevents答案:【independent】8、问题：LetAbetheeventthatastudentisenrolledinanaccountingcourse,andletSbetheeventthatastudentisenrolledinastatisticscourse.Itisknownthat30%ofallstudentsareenrolledinanaccountingcoursean选项：A:0.40B:0.30C:0.55D:0.15答案:【0.40】9、问题：GivenP(A)=0.40,P(B)=0.50,P(AB)=0.15.Whichofthefollowingistrue?选项：A:AandBarenotindependentB:AandBaremutuallyexclusiveC:AandBareindependentD:AandBarecollectivelyexhaustive答案:【AandBarenotindependent】10、问题：MeaganDaviesmanagesaportfolioof200commonstocks.Herstaffclassifiedtheportfoliostocksby‘industrysector’and‘investmentobjective’.InvestmentIndustrySectorObjectiveElectronicsAirlinesHealthcareTotalGrowth1001040150Income20201050Total1203050200WhichofthefollowingisNOTtrue?选项：A:GrowthandIncomearecomplementaryevents.B:ElectronicsandHealthcarearemutuallyexclusive.C:ElectronicsandGrowtharedependent.D:AirlinesandHealthcarearecollectivelyexhaustive.答案:【AirlinesandHealthcarearecollectivelyexhaustive.】第五章单元测试1、问题：Variableswhichtakeonvaluesonlyatcertainpointsoveragivenintervalarecalled_______.选项：A:continuousrandomvariablesB:discreterandomvariablesC:pointvariablesD:valuevariables答案:【discreterandomvariables】2、问题：Avariablethatcantakeonvaluesatanypointoveragivenintervaliscalled_______.选项：A:acontinuousrandomvariableB:adiscreterandomvariableC:avaluevariableD:apointvariable答案:【acontinuousrandomvariable】3$、问题：Youareofferedaninvestmentopportunity.Itsoutcomesandprobabilitiesarepresentedinthefollowingtable.XP(X)–1000.40$0.20+$1000.40Themeanofthisdistributionis_____________.选项：A:$200B:$0C:–$400D:$400答案:【$0】4$、问题：Youareofferedaninvestmentopportunity.Itsoutcomesandprobabilitiesarepresentedinthefollowingtable.XP(X)–1000.40$0.20+$1000.40Thestandarddeviationofthisdistributionis_____________.选项：A:$800,000B:$894C:–$400D:$663答案:【$894】5、问题：Thelong-runaverageormeanofaPoissondistributionisusuallyreferredtoas_______.选项：A:lB:mC:aD:s答案:【l】6、问题：ThevarianceofaPoissondistributionisequalto_______.选项：A:l/2B:lC:l2D:答案:【l】7、问题：IfXisabinomialrandomwithn=8andp=0.6,whatistheprobabilitythatXislessthanorequalto2?选项：A:0.050B:0.041C:0.375D:0.009答案:【0.050】8、问题：IfXisabinomialrandomwithn=8andp=0.6,whatistheprobabilitythatXisgreaterthan2?选项：B:0.950C:0.124D:0.991答案:【0.950】9、问题：Twenty-fiveitemsaresampled.Eachofthesehasthesameprobabilityofbeingdefective.Theprobabilitythatexactly2ofthe25aredefectivecouldbestbefoundby_______.选项：A:usingthePoissondistributionB:usingthenormaldistributionC:usingthebinomialdistributionD:usingtheexponentialdistribution答案:【usingthebinomialdistribution】1$0、问题：Youareofferedaninvestmentopportunity.Itsoutcomesandprobabilitiesarepresentedinthefollowingtable.XP(X)–1000.40$0.20+$1000.40Whichofthefollowingstatementsistrue?选项：A:Thisdistributionisskewedtotheleft.B:Thisdistributionissymmetric.C:Thisisabinomialdistribution.D:Thisdistributionisskewedtotheright.答案:【Thisdistributionissymmetric.】第六章单元测试1、问题：Thenormaldistributionisanexampleof_______.选项：A:adiscretedistributionB:anexponentialdistributionC:acontinuousdistributionD:abimodaldistribution答案:【acontinuousdistribution】2、问题：Thetotalareaunderneathanynormalcurveis_______.选项：A:equalto1B:equaltothevarianceC:equaltothemeanD:equaltothecoefficientofvariation答案:【equalto1】3、问题：Theareatotheleftofthemeaninanynormaldistributionis_______.选项：A:equalto0.5B:equaltothemeanC:equaltothevarianceD:equalto1答案:【equalto0.5】4、问题：Foranynormaldistribution,anyvaluelessthanthemeanwouldhavea_______.选项：A:negativez-scoreB:positivez-scoreC:negativeprobabilityofoccurringD:negativevariance答案:【negativez-score】5、问题：Astandardisednormaldistributionhasthefollowingcharacteristics:选项：A:hemeanandvariancearebothequalto1B:themeanisequaltothevarianceC:themeanisequalto0andthevarianceisequalto1D:themeanandvariancearebothequalto0答案:【themeanisequalto0andthevarianceisequalto1】6、问题：IfXisanormalrandomvariablewithmean80andstandarddeviation5,calculatethez-scoreifX=88.选项：A:1.8B:-1.8C:-1.6D:1.6答案:【1.6】7、问题：SupposeXisanormalrandomvariablewithmean60andstandarddeviation2.Az-scorewascalculatedforanumber,andthez-scoreis3.4.Whatisx?选项：A:63.4B:66.8C:56.6D:53.2答案:【66.8】8、问题：LetXbeanormalrandomvariablewithmean20andstandarddeviation4.FindP(16<X<22).选项：A:0.1498B:0.4672C:0.5328D:0.0328答案:【0.5328】9、问题：LetXbeanormalrandomvariablewithmean20andstandarddeviation4.The90thpercentileofXis____________.选项：A:20.000B:25.126C:26.579D:22.698答案:【25.126】10、问题：Az-scoreisthenumberof__________thatavalueisfromthemean.选项：A:variancesB:standarddeviationsC:milesD:units答案:【standarddeviations】第七章单元测试1、问题：Asageneralrule,thenormaldistributionisusedtoapproximatethesamplingdistributionofthesamplemeanonlyif选项：A:npandn(1–p)arebothgreaterthan5B:thesamplesizenissufficientlylargeC:thesamplemeaniscloseto0.50.D:theunderlyingpopulationisnormal答案:【thesamplesizenissufficientlylarge】2、问题：TheeightemployeesoftheArtDepartmentandtheir‘yearsofexperience’arelistedinthefollowingtable.EmployeeABCDEFGHExperience(years)1021115748Ifasampleofthreeemployeesisselec选项：A:56B:512C:336D:64答案:【512】3、问题：Asamplingdistributionisadistributionof_______________.选项：A:excessprofitstoselectedshareholders.B:apopulationparameter,suchas,μ.C:asamplestatistic,suchas,D:apopulationattribute,suchas,employee’sage.答案:【asamplestatistic,suchas,】4、问题：Thestandarddeviationofasamplingdistributioniscommonlycalled_______.选项：A:thestandarderror.B:statisticalmargin.C:statisticalleverage.D:theuniformspread.答案:【】5、问题：Thecentrallimittheoremstatesthatifnislargeenough,thedistributionofthesamplemeansis_____________distributedregardlessoftheshapeofthepopulation.选项：A:randomlyB:approximatelynormallyC:nonrandomlyD:uniformly答案:【approximatelynormally】6、问题：Accordingtothecentrallimittheorem,themeanofthesamplemeansforagivensizeofsampleisequalto_______.选项：A:thepopulationmeandividedbythesquarerootofnB:thepopulationmeanC:zeroD:thepopulationmeandividedbyn答案:【thepopulationmean】7、问题：Increasingthesamplesizecausesthestandarderrorofthemeanto________.选项：A:increaseinvalueB:decreaseinvalueC:destabiliseinvalueD:seekmarketequilibrium答案:【decreaseinvalue】8、问题：Increasingthesamplesizecausesthesamplingdistributionofto________.选项：A:shifttotheleftB:havelessdispersionC:havemoredispersionD:shifttotheright答案:【havelessdispersion】9、问题：Supposeapopulationhasameanof90andastandarddeviationof28.Ifarandomsampleofsize49isdrawnfromthepopulation,theprobabilityofdrawingasamplewithameanofmorethan95is_______.选项：A:0.4286B:0.8944C:0.3944D:0.1056答案:【0.1056】10、问题：Suppose40%ofalluniversitystudentshaveacomputerathomeandasampleof64istaken.Whatistheprobabilitythatmorethan30ofthoseinthesamplehaveacomputerathome?选项：A:0.3686B:0.1314C:0.6314D:0.8686答案:【0.1314】第八章单元测试1、问题：Whenarangeofvaluesisusedtoestimateapopulationparameter,itiscalled_______.选项：A:apointestimateB:arangeestimateC:astatisticalparameterD:anintervalestimate答案:【anintervalestimate】2、问题：CatherineCho,DirectorofMarketingResearchatVitalglowPtyLtd,isevaluatingconsumeracceptanceofanewtoothpastepackage.Herstaffreportthat17%ofarandomsampleof200Darwinhouseho选项：A:arangeestimateB:astatisticalparameterC:apointestimateD:anintervalestimate答案:【apointestimate】3、问题：Thez-valueassociatedwithatwo-sided90%confidenceintervalis_______.选项：A:1.96B:2.575C:1.645D:1.28答案:【1.645】4、问题：Supposearandomsampleof36isselectedfromapopulationwithastandarddeviationof12.Ifthesamplemeanis98,the99%confidenceintervaltoestimatethepopulationmeanis_______.选项：A:94.08to101.92B:97.35to98.65C:92.85to103.15D:93.34to102.66答案:【93.34to102.66】5、问题：SamGates,MarketingDirectorofMansfieldMotors’ElectricalDivision,isleadingastudytoassesstherelativeimportanceofproductfeatures.Anitemonasurveyquestionnairedistributedto121MansEaseofMaintenanceMean7.5PopulationStandardDeviation1.1The90%confidenceintervalforthepopulationmeanratingof‘easeofmaintenance’is_____.选项：A:7.30to7.70B:7.34to7.66C:5.69to9.31D:5.34to9.66答案:【7.34to7.66】6、问题：Aresearcherwantstoestimatetheproportionofthepopulationwhichpossessagivencharacteristic.Arandomsampleofsize600istakenresultingin330itemswhichpossessthecharacteristic.Thepointe选项：A:0.45B:0.33C:0.60D:0.55答案:【0.55】7、问题：Thet-distributionissimilartoanormaldistribution.Howeverthet-distributionis_______.选项：A:notsymmetricB:discreteC:bimodalD:flatter答案:【flatter】8、问题：Inordertofindvaluesinthet-distributiontable,youmustconvertthesamplesizeorsizesto_______.选项：A:populationsizesB:studentvaluesC:z-valuesD:degreesoffreedom答案:【degreesoffreedom】9、问题：Ifthedegreesoffreedominat-distributionbecomeverylarge,_______.选项：A:thesamplemeanapproacheszeroB:thepopulationsizemustbeverylargeC:thet-valuesandthez-valuesarealmostthesameD:thesamplesizemustbeverysmall答案:【thet-valuesandthez-valuesarealmostthesame】10、问题：Infindingaconfidenceintervalforthepopulationmean,thepopulationstandarddeviationshouldbeusedifitisknown.Ifthepopulationstandarddeviationisnotknown,thenitshouldbeestimatedwith__选项：A:thesamplevarianceB:therangeC:themeanD:thesamplestandarddeviation答案:【thesamplestandarddeviation】第九章单元测试1、问题：Thefirststepintestingahypothesisistoestablish_______.选项：A:anotrejectancehypothesisandarejectionhypothesisB:anindirecthypothesisC:apowerfunctionD:anullhypothesisandalternativehypothesis答案:【anullhypothesisandalternativehypothesis】2、问题：Considerthefollowingnullandalternativehypotheses.Ho:m<=7Ha:m>6Thesehypotheses_______________.选项：A:areestablishedcorrectlyB:arenotcollectivelyexhaustiveC:arenotmutuallyexclusiveD:donotreferenceapopulationparameter答案:【arenotmutuallyexclusive】3、问题：Considerthefollowingnullandalternativehypotheses.Ho:m>=7Ha:m<6Thesehypotheses_______________.选项：A:areestablishedcorrectlyB:arenotcollectivelyexhaustiveC:arenotmutuallyexclusiveD:donotreferenceapopulationparameter答案:【arenotcollectivelyexhaustive】4、问题：Considerthefollowingnullandalternativehypotheses.Ho:￡352Ha:>352Thesehypotheses_______________.选项：A:arenotmutuallyexclusiveB:donotreferenceapopulationparameterC:arenotcollectivelyexhaustiveD:areestablishedcorrectly答案:【donotreferenceapopulationparameter】5、问题：Theregionofthedistributioninhypothesistestinginwhichthenullhypothesisisrejectediscalledthe_______.选项：A:alternativeregionB:notrejectanceregionC:rejectionregionD:nullregion答案:【rejectionregion】6、问题：Therejectionandnotrejectanceregionsaredividedbyapointcalledthe_______.选项：A:notrejectancevalueB:rejectionvalueC:criticalvalueD:dividingpoint答案:【criticalvalue】7、问题：TheprobabilityofcommittingaTypeIIerrorisrepresentedby_______.选项：A:1–aB:aC:bD:a/2答案:【b】8、问题：JenniferCantu,CustomerServicesManageratTri-NationAutoInsurance,monitorstheclaimsprocessingtimeoftheclaimsdivision.Herstandardincludes‘ameanprocessingtimeof5daysorless’.Eachweek,herstaffchecksforcompliancebyanalysin选项：A:<5B:n=60C:>5D:5答案:【>5】9、问题：Themanufacturersofadeodorantclaimthatthemeandryingtimeoftheirproductis,atmost,15minutes.Asampleconsistingof16cansoftheproductwasusedtotestthemanufacturer’sclaim.Theexperim选项：A:Computedteststatistic=2andisgreaterthan2.131,sorejectH0:μ≤15.B:Computedteststatistic=2andisgreaterthan1.645,sorejectH0:μ≤15.C:Computedteststatistic=2andisgreaterthan1.96,sorejectH0:μ≤15.D:Computedteststatistic=2andisgreaterthan1.753,sorejectH0:μ=15.答案:【Computedteststatistic=2andisgreaterthan1.753,sorejectH0:μ=15.】10、问题：Whathappenstotherejectionregionifthelevelofsignificanceischangedfrom0.10to0.05?选项：A:itgetslargerB:itgetssmallerC:itdoesnotchange答案:【itgetssmaller】第十章单元测试1、问题：Restaurateur,DanielValentine,isevaluatingtwosites,PortDouglasandMissionBeach,forhisnextrestaurant.HewantstoprovethatPortDouglasresidents(population1)dineoutmoreoftenthanMissi选项：A:m1–m2>0B:p1–p2=0C:m1≤m2D:s12<s22答案:【m1≤m2】2、问题：Aresearcherwantstoestimatethedifferenceinthemeansoftwopopulations.Arandomsampleof36itemsfromthefirstpopulationresultsinasamplemeanof430.Arandomsampleof49itemsfromthese选项：A:46B:-30C:-13D:43答案:【-30】3、问题：Aresearcherwantstoestimatethedifferenceinthemeansoftwopopulations.Arandomsampleof36itemsfromthefirstpopulationresultsinasamplemeanof430.Arandomsampleof49itemsfromthese选项：A:–95.90to35.90B:85.44to25.44C:–76.53to16.53D:–102.83to42.43答案:【85.44to25.44】4、问题：Aresearcherisinterestedintestingtodetermineifthemeanofpopulationoneisgreaterthanthemeanofpopulationtwo.Thenullhypothesisisthatthereisnodifferenceinthepopulationmeans(i.e.thediffe选项：A:22B:15C:23D:2答案:【15】5、问题：Aresearcherwantstoconductabefore/afterstudyon11subjectstodetermineifatreatmentresultsinanydifferenceinscores.Thenullhypothesisisthattheaveragedifferenceiszerowhilethealternativeh.40withasamplestandarddeviationof1.21.Assumethatthedifferencesarenormallydistributedinthepopulation.Thedegreesoffreedomforthistestare_______.2选项：A:10B:20D:9答案:【10】61、问题：Aresearcherisperformingatwo-tailedrelatedsamples(matchedpairs)t-test.Atotalof12peopleareinthesample,andbeforeandaftermeasuresaretaken.Theobservedt-valueforthisis–.84.Thelevelofsignificanceis0.05.Thecorrectdecisionisto_______.选项：A:donotrejectthenullhypothesisB:rejectthenullhypothesisC:takealargersampleD:usethez-tableinsteadofthet-table答案:【donotrejectthenullhypothesis】7、问题：StefanIrwin,MarketingManageratClassicMerchandise,isinvestigatingresponseratestoscentedandunscenteddirectmailcatalogues.Iftheresponserateforthescentedcatalogue(population1)ishigfiveorders(twenty-fivefromthescentedandtwentyfromtheunscented)werereceivedfromthetestcatalogues.Assuminga=.01,Mike’salternatehypothesisis________________.选项：A:p1–p2>0B:m1–m2=0C:m1–μ2≠0D:s12<s22答案:【p1–p2>0】8、问题：CowraConstructionCompanypurchasessteelrodsforitsprojects.Basedonprevioustests,ClarrieCarter,QualityAssuranceManager,hasrecommendedpurchasingrodsfromReddingRods(populat选项：A:s12=s22B:s12>s22C:s12<s22D:s12≠s22答案:【s12>s22】9、问题：TamaraHill,FundManagerwithHillcrestValueFund,managesaportfolioof250commonstocks.Tamaraissearchingfora‘lowrisk’issuetoaddtotheportfolio,i.e.onewithapricevariancelessthanthat选项：A:donotrejectthenullhypothesiss121s22B:ejectthenullhypothesiss121s22C:rejectthenullhypothesiss12=s22D:donotrejectthenullhypothesiss12=s22答案:【donotrejectthenullhypothesiss12=s22】10、问题：CindyHo,FinanceManageratRedHillRadiatorSupplies(RHRS),theorisesthatthediscountlevelofferedtocreditcustomersaffectstheaveragecollectionperiodoncreditsales.Accordingly,shehasdeSSdfMSF5.3531.783333Error177.216182.5519Usinga=0.01,theappropriatedecisionis_________.选项：A:donotrejectthenullhypothesism1=m2=m3=m4B:rejectthenullhypothesism1≠m2≠m3≠m4C:donotrejectthenullhypothesism1≠m2≠m3≠m4D:rejectthenullhypothesism1=m2=m3=m4答案:【donotrejectthenullhypothesism1=m2=m3=m4】第十一章单元测试1、问题：Forthesamesetofobservationsonaspecifieddependentvariable,twodifferentindependentvariableswereusedtodevelop2simplelinearregressionmodels.Theresultsaresummarizedasfollows:Basedonth