第1題Theuniverseor"totalityofitemsorthings"underconsiderationiscalledAasample.Bapopulation.Caparameter.Dastatistic.第2題Theestimationofthepopulationaveragefamilyexpenditureonfoodbasedonthesampleaverageexpenditureof1,000familiesisanexampleof

Ainferentialstatistics.Bdescriptivestatistics.Caparameter.Dastatistic.第3題ThecollectionandsummarizationofthesocioeconomicandphysicalcharacteristicsoftheemployeesofaparticularfirmisanexampleofAdescriptivestatistics.Binferentialstatistics.Caparameter.Dastatistic.第4題TheprocessofusingsamplestatisticstodrawconclusionsabouttruepopulationparametersiscalledAstatisticalinference.Bthescientificmethod.Csampling.Ddescriptivestatistics.第5題Thosemethodsinvolvingthecollection,presentation,andcharacterizationofasetofdatainordertoproperlydescribethevariousfeaturesofthatsetofdataarecalledAdescriptivestatistics.Bsampling.Cthescientificmethod.Dstatisticalinference.第6題Tomonitorcampussecurity,thecampuspoliceofficeistakingasurveyofthenumberofstudentsinaparkingloteach30minutesofa24-hourperiodwiththegoalofdeterminingwhenpatrolsofthelotwouldservethemoststudents.IfXisthenumberofstudentsintheloteachperiodoftime,thenXisanexampleofAacategoricalrandomvariable.Badiscreterandomvariable.Cacontinuousrandomvariable.Dastatistic.第7題ResearchersareconcernedthattheweightoftheaverageAmericanschoolchildisincreasingimplying,amongotherthings,thatchildren'sclothingshouldbemanufacturedandmarketedinlargersizes.IfXistheweightofschoolchildrensampledinanationwidestudy,thenXisanexampleofAacategoricalvariable.Badiscreterandomvariable.Cacontinuousrandomvariable.Daparameter.第8題Theclassificationofstudentclassdesignation(freshman,sophomore,junior,senior)isanexampleofAacategoricalrandomvariable.Badiscreterandomvariable.Cacontinuousrandomvariable.Daparameter.第9題Thechancellorofamajoruniversitywasconcernedaboutalcoholabuseonhercampusandwantedtofindouttheproportionofstudentsatheruniversitywhovisitedcampusharsontheweekendbeforethefinalexamweek.Heradvisortookarandomsampleof250students.TheportionofstudentsinthesamplewhovisitedcampusbarsontheweekendbeforethefinalexamweekisanexampleofAacategoricalrandomvariable.Badiscreterandomvariable.CaparameterDastatistic.第10題Thechancellorofamajoruniversitywasconcernedaboutalcoholabuseonhercampusandwantedtofindouttheproportionofstudentsatheruniversitywhovisitedcampusharsontheweekendbeforethefinalexamweek.Heradvisortookarandomsampleof250students.TheportionofallstudentsatheruniversitywhovisitedcampusbarsontheweekendbeforethefinalexamweekisanexampleofAacategoricalrandomvariable.Badiscreterandomvariable.Cacontinuousrandomvariable.Daparameter.第1題Whenpolygonsorhistogramsareconstructed,whichaxismustshowthetruezeroor"origin"?AThehorizontalaxis.BTheverticalaxis.CBoththehorizontalaxisandverticalaxis.DNeitherthehorizontalnortheverticalaxis.第2題ThewidthofeachbarinahistogramcorrespondstotheAdifferencesbetweenthebounariesoftheclass.Bnumberofobservationsineachclass.Cmidpontofeachclass.Dpercentageofobservationsineachclass.第3題AtypeofverticalbarchartinwhichthecategoriesareplottedinthedescendingrankorderofthemagnitudeoftheirfrequenciesiscalledaAcontingencytable.BParetodiagram.Cdotplot.Dpiechart.第4題Aninsurancecompanyevaluatesmanynumericalvariablesaboutapersonbeforedecidingonanappropriaterateforautomobileinsurance.Arepresentativefromalocalinsuranceagencyselectedarandomsampleofinsureddriversandrecorded,

X,thenumberofclaimseachmadeinthelast3years,withthefollowingresults.

f

isthecorrespondingfrequency.X1

2

3

4

5f1418125

1Howmanydriversarerepresentedinthesample?

A5B15C18D50第5題Aninsurancecompanyevaluatesmanynumericalvariablesaboutapersonbeforedecidingonanappropriaterateforautomobileinsurance.Arepresentativefromalocalinsuranceagencyselectedarandomsampleofinsureddriversandrecorded,X,thenumberofclaimseachmadeinthelast3years,withthefollowingresults.fisthecorrespondingfrequency.X1

2

3

4

5f1418125

1Howmanytotalclaimsarerepresentedinthesample?A1B50C111D250第6題Asurveywasconductedtodeterminehowpeopleratedthequalityofprogrammingavailableontelevision.Respondentswereaskedtoratetheoverallqualityfrom0(noqualityatall)to100(extremelygoodquality).Thestem-and-leafdisplayofthedataisshownbelow.StemLeaves32440347899950112345612566701892____percentoftherespondentsratedoveralltelevisionqualitywitharatingof50orbelow?

正確答案：:44第7題Thefollowingarethedurationsinminutesofasampleoflong-distancephonecallsmadewithinthecontinentalUnitedStatesreportedbyonelong-distancecarrier.Time(inminutes)

RelativeFrequency0butlessthan50.375butlessthan100.22

10butlessthan15

0.15

15butlessthan20

0.10

20butlessthan25

0.07

25butlessthan30

0.07

30ormore0.02

If1,000callswererandomlysampled,____callslastedunder10minutes?正確答案：:590第8題Asampleof200studentsataBig-Tenuniversitywastakenafterthemidtermtoaskthemwhethertheywentbarhoppingtheweekendbeforethemidtermorspenttheweekendstudying,andwhethertheydidwellorpoorlyonthemidterm.Thefollowingtablecontainstheresults.DidWellinMidtermDidPoorlyinMidtermStudyingforexam80

20

Wentbarhopping

30

70Ifthesampleisagoodrepresentationofthepopulation,wecanexpect

____percentofthestudentsinthepopulationtospendtheweekendstudyinganddopoorlyonthemidterm.正確答案：:10第9題AWal-Martstoreinasmalltownmonitorscustomercomplaintsandorganizesthesecomplaintsintosixdistinctcategories.Overthepastyear,thecompanyhasreceived534complaints.OnepossiblegraphicalmethodforrepresentingthesedaawouldbeaParetochart.

第10題AppleComputer,Inc.collectedinformationontheageoftheircustomers.Theyoungestcustomerwas12andtheoldestwas72.Tostudythedistributionoftheageamongitscustomers,itcanuseaParetochart.Quiz第1題Ingeneral,whichofthefollowingdescriptivesummarymeasurescannotbeeasilyapproximatedfromabox-and-whiskerplot?

AThevariance.BTherange.CTheinterquartilerange.DThemedian.第2題Inaperfectlysymmetricalbell-shaped"normal"distributionAthearithmeticmeanequalsthemedian.Bthemedianequalsthemode.Cthearithmeticmeanequalsthemode.DAlloftheabove.第3題Inaright-skeweddistributionAthemedianequalsthearithmeticmean.Bthemedianislessthanthearithmeticmean.Cthemedianislargerthanthearithmeticmean.Dnoneoftheabove.第4題Whichofthearithmeticmean,median,mode,andgeometricmeanareresistantmeasuresofcentraltendency?AThearithmetricmeanandmedianonly.BThemedianandmodeonly.CThemodeandgeometricmeanonly.DThearithmeticmeanandmodeonly.第5題Whichofthefollowingstatisticsisnotameasureofcentraltendency?AArithmeticmean.BMedian.CMode.DQ3.第6題AccordingtotheChebyshevrule,atleast93.75%ofallobservationsinanydatasetarecontainedwithinadistanceofhowmanystandarddeviationsaroundthemean?A1B2C3D4第7題Healthcareissuesarereceivingmuchattentioninbothacademicandpoliticalarenas.Asociologistrecentlyconductedasurveyofcitizensover60yearsofagewhosenetworthistoohightoqualifyforMedicaidandhavenoprivatehealthinsurance.Theagesof25uninsuredseniorcitizenswereasfollows:60616263646566686869707373747576768181828687899092Themedianageoftheuninsuredseniorcitizensis____years.

正確答案：:73第8題Healthcareissuesarereceivingmuchattentioninbothacademicandpoliticalarenas.Asociologistrecentlyconductedasurveyofcitizensover60yearsofagewhosenetworthistoohightoqualifyforMedicaidandhavenoprivatehealthinsurance.Theagesof25uninsuredseniorcitizenswereasfollows:60616263646566686869707373747576768181828687899092Theinterquartilerangeoftheagesoftheuninsuredcitizensis

____years.正確答案：:16第9題Healthcareissuesarereceivingmuchattentioninbothacademicandpoliticalarenas.Asociologistrecentlyconductedasurveyofcitizensover60yearsofagewhosenetworthistoohightoqualifyforMedicaidandhavenoprivatehealthinsurance.Theagesof25uninsuredseniorcitizenswereasfollows:60616263646566686869707373747576768181828687899092Thestandarddeviationoftheagesoftheuninsuredseniorcitizensis

____years(correcttothenearesthundredthofayear).正確答案：:9.74第10題Healthcareissuesarereceivingmuchattentioninbothacademicandpoliticalarenas.Asociologistrecentlyconductedasurveyofcitizensover60yearsofagewhosenetworthistoohightoqualifyforMedicaidandhavenoprivatehealthinsurance.Theagesof25uninsuredseniorcitizenswereasfollows:60616263646566686869707373747576768181828687899092Thecoefficientofvariationoftheagesoftheuninsuredseniorcitizensis

____%(correcttotheseconddecimalplace).正確答案：:13.16Quiz第1題Forairtravelers,oneofthebiggestcomplaintsisofthewaitingtimebetweenwhentheairplanetaxisawayfromtheterminaluntiltheflighttakesoff.Thiswaitingtimeisknowntohaveaskewed-rightdistributionwithameanof10minutesandastandarddeviationof8minutes.Suppose100flightshavebeenrandomlysampled.Describethesamplingdistributionofthemeanwaitingtimebetweenwhentheairplanetaxisawayfromtheterminaluntiltheflighttakesoffforthese100flights.ADistributionisskewed-rightwithmean=10minutesandstandarderror=0.8minutes.BDistributionisskewed-rightwithmean=10minutesandstandarderror=8minutes.CDistributionisapproximatelynormalwithmean=10minutesandstandarderror=0.8minutes.DDistributionisapproximatelynormalwithmean=10minutesandstandarderror=8minutes.第2題Iftheexpectationofasamplingdistributionislocatedattheparameteritisestimating,thenwecallthatsamplingdistributionAunbiased.Bminimumvariance.Cbiased.Drandom.第3題TheCentralLimitTheoremisimportantinstatisticsbecauseAforalargen,itsaysthepopulationisapproximatelynormal.Bforanypopulation,itsaysthesamplingdistributionofthesamplemeanisapproximatelynormal,regardlessofthesamplesize.Cforalargen,itsaysthesamplingdistributionofthesamplemeanisapproximatelynormal,regardlessoftheshapeofthepopulation.Dforanysizedsample,itsaysthesamplingdistributionofthesamplemeanisapproximatelynormal.第4題ThestandarderrorofthemeanAisneverlargerthanthestandarddeviationofthepopulation.Bdecreasesasthesamplesizeincreases.Cmeasuresthevariabilityofthemeanfromsampletosample.DAlloftheabove.第5題SamplingdistributionsdescribethedistributionofAparameters.Bstatistics.Cbothparametersandstatistics.Dneitherparametersnorstatistics.第6題Atacomputermanufacturingcompany,theactualsizeofcomputerchipsisnormallydistributedwithameanof1centimeterandastandarddeviationof0.1centimeter.Arandomsampleof12computerchipsistaken.Theprobabilitythatthesamplemeanwillbebelow0.95centimetersisequalto

____(correcttothefourthdecimalplace).第7題Accordingtoasurvey,only15%ofcustomerswhovisitedthewebsiteofamajorretailstoremadeapurchase.Randomsamplesofsize50areselected.Theaverageofallthesampleproportionsofcustomerswhowillmakeapurchaseaftervisitingthewebsiteis

____%(correcttotheinteger).第8題Accordingtoasurvey,only15%ofcustomerswhovisitedthewebsiteofamajorretailstoremadeapurchase.Randomsamplesofsize50areselected.90%ofthesampleswillhavelessthan

____%ofcustomerswhowillmakeapuechaseaftervisitingthewebsite(correcttotheseconddecimalplace).第9題Theeveninghostofadinnerdancereachedintoabowl,mixedalltheticketsaround,andselectthetickettoawardthegranddoorprize.Whatsamplingmethodwasused?ASimplerandomsampleBSystemeticsampleCStratifiedsampleDClustersample第10題Whichofthefollowingcanbereducedbyproperinterviewertraining?ASamplingerrorBMeasurementerrorCBothoftheaboveDNoneoftheaboveQuiz第1題IfXhasthebinomialdistributionwiththeparametersnand,thenthesampleproportion,

X/n,

isanunbiasedestimatorof.第2題SupposethattherandomvariableXfollowsanormaldistributionwithmean

andvariance.Then,thefollowingstatisticsareallunbiasedestimatorsfor

.

第3題Regardlessofthepopulationdistribution,thesamplemomentsarealwaystheunbiasedestimatesforthepopulationmomentswiththesameorder.第4題Theeficiencyofanyestimatorcouldbeevaluatedbycomparingitsvariance,thesmallerthebetter.第5題SupposethattherandomvariableXfollowsanormaldistributionwithmean

andvariance

.Then,forthefollowingstatistics,whichoneisthemosteffecient?

ABCDNoneoftheabove.第6題Eightpistonringsarerandomlydrawnfromabatchofproductandthediameterofeachringismeasured.Thedataaregivenasbelow:74.001,74.005,74.003,74.001,74.000,73.998,74.006,74.002.

Thesamplestandarddeviation

isequalto

____x10E-6,whichisapointestimateofpopulationvariance

.(correcttotheseconddecimalplace.)正確答案：:6.86第7題Eightpistonringsarerandomlydrawnfromabatchofproductandthediameterofeachringismeasured.Thedataaregivenasbelow:74.001,74.005,74.003,74.001,74.000,73.998,74.006,74.002.Themomentestimateforpopulationmeanisequalto

____

(correcttothethirddecimalplace).正確答案：:74.002第8題Eightpistonringsarerandomlydrawnfromabatchofproductandthediameterofeachringismeasured.Thedataaregivenasbelow:74.001,74.005,74.003,74.001,74.000,73.998,74.006,74.002.Themomentestimateforpopulationvarianceisequalto

____x10E-6(correcttothefirstdecimalplace).正確答案：:6.0第9題第10題Quiz第1題ThewidthofaconfidenceintervalestimateforaproportionwillbeAnarrower

for90%confidencethanfor95%confidence.Bnarrower

for99%confidencethanfor95%confidence.Cwiderforasamplesizeof100thanforasamplesizeof50.Dnarrowerwhenthesampleproportionis0.50thanwhenthesampleproportionis0.20.第2題TheheadlibrarianattheLibraryofCongresshasaskedherassistantforanintervalestimateofthemeannumberofbookscheckedouteachday.Theassistantprovidesthefollowingintervalestimate:from740to920booksperday.Iftheheadlibrarianknowsthatthepopulationstandarddeviationis150bookscheckedoutperday,approximatelyhowlargeasampledidherassistantusetodeterminetheintervalestimate?AItcannotbedeterminedfromtheinformationgiven.B2C3D12第3題Ifyouwereconstructinga99%confidenceintervalofthepopulationmeanbasedonasampleofn=25,wherethestandarddeviationofthesamples=0.05,thecriticalvalueoftwillbeA2.7969B2.7874C2.4922D2.4851第4題Whendeterminingthesamplesizeforaproportionforagivenlevelofconfidenceandsamplingerror,thecloserto0.50thatpisestimatedtobe,the__________thesamplesizerequired.AlargerBsmallerCsamplesizeisnotaffected.DTheeffectcannotbedeterminedfromtheinformationgiven.第5題Privatecollegesanduniversitiesrelyonmoneycontributedbyindividualsandcorporationsfortheiroperatingexpenses.Muchofthismoneyisputintoafundcalledanendowment,andthecollegespendsonlytheinterestearnedbythefund.Arecentsurveyof8privatecollegesintheUnitedStatesrevealedthefollowingendowments(inmillionsofdollars):60.2,47.0,235.1,490.0,122.6,177.5,95.4,and220.0.Summarystatisticsyield=180.975ands=143.042.Calculatea95%confidenceintervalforthemeanendowmentofalltheprivatecollegesintheUnitedStates,assuminganormaldistributionfortheendowments.A$180.975$119.586B$180.975$94.066C$180.975$99.123D$180.975$116.621第6題Auniversitydeanisinterestedindeterminingtheproportionofstudentswhoreceivesomesortoffinancialaid.Ratherthanexaminetherecordsforallstudents,thedeanrandomlyselects200studentsandfindsthat118ofthemarereceivingfinancialaid.Usea90%

confidenceintervaltoestimatethetrueproportionofstudentswhoreceivefinancialaid.A0.590.057B0.590.068C0.590.087D0.590.048第7題Auniversitydeanisinterestedindeterminingtheproportionofstudentswhoreceivesomesortoffinancialaid.Ratherthanexaminetherecordsforallstudents,thedeanrandomlyselects200studentsandfindsthat118ofthemarereceivingfinancialaid.Ifthedeanwantedtoestimatetheproportionofallstudentsreceivingfinancialaidtowithin3%with99%reliability,howmanystudentswouldneedtobesampled?An=1,784Bn=1,844Cn=1,503Dn=1,435第8題Aneconomistisinterestedinstudyingtheincomesofconsumersinaparticularregion.Thepopulationstandard

deviationisknowntobe1,000.Arandomsampleof50individualsresultedinanaverageincomeof15,000.Whatisthewidthofthe90%confidenceinterval?A$465.23B$232.60C$364.30D$728.60第9題Aneconomistisinterestedinstudyingtheincomesofconsumersinaparticularregion.Thepopulationstandarddeviationisknowntobe1,000.Arandomsampleof50individualsresultedinanaverageincomeof15,000.Whatsamplesizewouldtheeconomistneedtousefora95%confidenceintervalifthewidthoftheintervalshouldnotbemorethan$100?An=1537Bn=385Cn=40Dn=20第10題ItisdesiredtoestimatetheaveragetotalcompensationofCEOsintheServiceindustry.Datawererandomlycollectedfrom18CEOsandthe97%confidenceintervalwascalculatedtobe

(2,181,260,5,836,180).Whichofthefollowinginterpretationsiscorrect?AWeare97%confidentthattheaveragetotalcompensationofallCEOsintheServiceindustryfallsintheinterval2,181,260to5,836,180.BInthepopulationofServiceindustryCEOs,97%ofthemwillhavetotalcompensationsthatfallintheinterval2,181,260to5,836,180.CWeare97%confidentthatthemeanofthesampledCEOsfallsintheinterval2,181,260to5,836,180.D

97%ofthesampledtotalcompensationvaluesfellbetween2,181,260and5,836,180.Quiz第1題Whichofthefollowingwouldbeanappropriatenullhypothesis?AThemeanofapopulationisequalto55.BThemeanofasampleisequalto55.CThemeanofapopulationisgreaterthan55.DOnly(A)and(C)aretrue.第2題ThepowerofatestismeasuredbyitscapabilityofArejectinganullhypothesisthatisfalse.Brejectinganullhypothesisthatistrue.Cnotrejectinganullhypothesisthatistrue.Dnotrejectinganullhypothesisthatisfalse.第3題IfatestofhypothesishasaTypeIerrorprobability()of0.01,wemeanAifthenullhypothesisistrue,werejectit1%ofthe

time.Bifthenullhypothesisistrue,wedon'trejectit1%ofthetime.Cifthenullhypothesisisfalse,wedon'trejectit1%ofthetime.Difthenullhypothesisisfalse,werejectit1%ofthetime.第4題HowmanyKleenexshouldtheKimberlyClarkCorporationpackageoftissuescontain?Researchersdeterminedthat60tissuesistheaveragenumberoftissuesusedduringacold.Supposearandomsampleof100Kleenexusersyieldedthefollowingdataonthenumberoftissuesusedduringacold:

=52,s=22.Givethenullandalternativehypothesestodetermineifthenumberoftissuesusedduringacoldislessthan60.AH0:andH1:.BH0:andH1:.CH0:

andH1:.DH0:andH1:.第5題HowmanyKleenexshouldtheKimberlyClarkCorporationpackageoftissuescontain?Researchersdeterminedthat60tissuesistheaveragenumberoftissuesusedduringacold.Supposearandomsampleof100Kleenexusersyieldedthefollowingdataonthenumberoftissuesusedduringacold:

=52,s=22.SupposethealternativewewantedtotestwasH1:.StatethecorrectrejectionregionforARejectH0ift<–1.6604.BRejectH0ift>1.6604.CRejectH0ift>1.9842orZ<–1.9842.DRejectH0ift<–1.9842.第6題HowmanyKleenexshouldtheKimberlyClarkCorporationpackageoftissuescontain?Researchersdeterminedthat60tissuesistheaveragenumberoftissuesusedduringacold.Supposearandomsampleof100Kleenexusersyieldedthefollowingdataonthenumberoftissuesusedduringacold:

=52,s=22.Supposetheteststatisticdoesfallintherejectionregionat

=0.05.Whichofthefollowingdecisionsiscorrect?AAt

=0.05,werejectH0.BAt

=0.05,wedonotrejectH0.CAt

=0.05,weacceptH0.DAt

=0.10,wedonotrejectH0.第7題HowmanyKleenexshouldtheKimberlyClarkCorporationpackageoftissuescontain?Researchersdeterminedthat60tissuesistheaveragenumberoftissuesusedduringacold.Supposearandomsampleof100Kleenexusersyieldedthefollowingdataonthenumberoftissuesusedduringacold:

=52,s=22.Supposetheteststatisticdoesfallintherejectionregionat

=0.05.Whichofthefollowingconclusionsiscorrect?AAt

=0.10,thereissufficientevidencetoconcludethattheaveragenumberoftissuesusedduringacoldisnot60tissues.BAt

=0.05,thereisnotsufficientevidencetoconcludethattheaveragenumberoftissuesusedduringacoldis60tissues.CAt

=0.05,thereissufficientevidencetoconcludethattheaveragenumberoftissuesusedduringacoldis60tissues.DAt

=0.05,thereisnotsufficientevidencetoconcludethattheaveragenumberoftissuesusedduringacoldisnot60tissues.第8題Wehavecreateda95%confidenceintervalforwiththeresult(10,15).WhatdecisionwillwemakeifwetestH0:versusH1:at

?ARejectH0infavorofH1.BAcceptH0infavorofH1.CFailtorejectH0infavorofH1.DWecannottellwhatourdecisionwillbefromtheinformationgiven.第9題WhichofthefollowingstatementsisNOTtrueaboutthelevelofsignificanceinahypothesistest?AThesignificancelevelisanothernameforTypeIIerror.BThelargerthelevelofsignificance,themorelikelyyouaretorejectthenullhypothesis.CThelevelofsignificanceisthemaximumriskwearewillingtoacceptinmakingaTypeIerror.DThesignificancelevelisalsocalledthe

level.第10題Asurveyclaimsthat9outof10doctorsrecommendaspirinfortheirpatientswithheadaches.Totestthisclaimagainstthealternativethattheactualproportionofdoctorswhorecommendaspirinislessthan0.90,arandomsampleof100doctorswasselected.Supposethattheteststatisticis–2.20.CanweconcludethatH0shouldberejectedatthe(a)

=0.10,(b)

=0.05,and(c)

=0.01levelofTypeIerror?A(a)yes;(b)yes;(c)noB(a)yes;(b)yes;(c)yesC(a)no;(b)no;(c)noD(a)no;(b)no;(c)yesQuiz第1題AreJapanesemanagersmoremotivatedthanAmericanmanagers?ArandomlyselectedgroupofeachwereadministeredtheSarnoffSurveyofAttitudesTowardLife(SSATL),whichmeasuresmotivationforupwardmobility.TheSSATLscoresaresummarizedbelow.

AmericanJapaneseSampleSize211100MeanSSATLScore65.7579.83PopulationStd.Dev.11.076.41whichtestwouldlikelybemostappropriatetoemploy?AindependentsamplesZtestforthedifferenceinmeansBrelatedsamplesttestformeandifferenceCpooled-variancettestforthedifferenceinmeansDrelatedsamplesZtestformeandifferenceQuiz第1題TheYintercept(b0)representstheApredictedvalueof

Y

when

X

=0.Bchangeinestimatedaverage

Y

perunitchangein

X.C

predictedvalueof

Y.Dvariationaroundthesampleregressionline.第2題TheYintercept(b0)representstheAestimatedaverage

Y

when

X

=0.B

changeinestimatedaverage

Y

perunitchangein

X.Cpredictedvalueof

Y.Dvariationaroundthesampleregressionline.第3題Theslope(b1)representsAtheestimatedaveragechangein

Y

perunitchangein

X.Bpredictedvalueof

Y

when

X

=0.Cthepredictedvalueof

Y.Dvariationaroundthelineofregression.第4題Theleastsquaresmethodminimizeswhichofthefollowing?ASSEBSSTC

SSRDalloftheabove第5題Alargenationalbankchargeslocalcompaniesforusingtheirservices.Abankofficialreportedtheresultsofaregressionanalysisdesignedtopredictthebank’scharges(Y)--measuredindollarspermonth--forservicesrenderedtolocalcompanies.Oneindependentvariableusedtopredictservicechargetoacompanyisthecompany’ssalesrevenue(X)--measuredinmillionsofdollars.Datafor21companieswhousethebank’sserviceswereusedtofitthemodel:Theresultsofthesimplelinearregressionareprovidedbelow.Interprettheestimateof,theY

interceptoftheline.AThereisnopracticalinterpretation,sinceasalesrevenueof$0isanonsensicalvalue.BAllcompanieswillbechargedatleast$2,700bythebank.CAbout95%oftheobservedservicechargesfallwithin$2,700oftheleastsquaresline.DForevery1milliondollarsincreaseinsalesrevenue,weexpectaservicechargetodecrease2,700dollars.第6題Alargenationalbankchargeslocalcompaniesforusingtheirservices.Abankofficialreportedtheresultsofaregressionanalysisdesignedtopredictthebank’scharges(Y)--measuredindollarspermonth--forservicesrenderedtolocalcompanies.Oneindependentvariableusedtopredictservicechargetoacompanyisthecompany’ssalesrevenue(X)--measuredinmillionsofdollars.Datafor21companieswhousethebank’sserviceswereusedtofitthemodel:E(Y)=β0+β1XTheresultsofthesimplelinearregressionareprovidedbelow.predictedY=2,700+20X,SYX=65,two?tailedpvalue=0.034(fortestingβ1)Interpret

thestandarderroroftheestimateinthemodel.AAbout95%oftheobservedservicechargesfallwithin$130oftheleastsquaresline.BAbout95%oftheobservedservicechargesfallwithin$65oftheleastsquaresline.CAbout95%oftheobservedservicechargesequaltheircorrespondingpredictedvalues.DForevery1millionincreaseinsalesrevenue,weexpectaservicechargetoincrease65dollars.第7題Alargenationalbankchargeslocalcompaniesforusingtheirservices.Abankofficialreportedtheresultsofaregressionanalysisdesignedtopredictthebank’scharges(Y)--measuredindollarspermonth--forservicesrenderedtolocalcompanies.Oneindependentvariableusedtopredictservicechargetoacompanyisthecompany’ssalesrevenue(X)--measure