中国大学mooc《statistics(浙江财经大学) 》章节测试答案

titlestatistics(浙江财经大学)中国大学mooc答案100分最新版contentChapter1Introductiontostatisticsquizzes11、Inaquestionnaire,respondentsareaskedtomarktheirgenderasmaleorfemale.Genderisanexampleofthe（）答案:B.nominalscale2、Thenominalscaleofmeasurementhasthepropertiesofthe（）.答案:D.Noneofthesealternativesiscorrect.3、Thescaleofmeasurementthatisusedtorankordertheobservationforavariableiscalledthe（）.答案:B.ordinalscale4、Theratioscaleofmeasurementhasthepropertiesof（）.答案:D.theintervalscale5、Theintervalscaleofmeasurementhasthepropertiesofthe（）.答案:D.Noneofthesealternativesiscorrect.6、Dataobtainedfromanominalscale（）.答案:B.canbeeithernumericornonnumeric7、Thescaleofmeasurementthathasaninherentzerovaluedefinedisthe（）.答案:A.ratioscale8、Quantitativedatareferstodataobtainedwitha(n)（）.答案:C.eitherintervalorratioscale9、Theentitiesonwhichdataarecollectedare（）.答案:A.elements10、Thesetofmeasurementscollectedforaparticularelementis(are)called（）.答案:B.observations11、Theweightofacandybarinouncesisanexampleof（）.答案:D.quantitativedata12、Theheightofabuilding,measuredinfeet,isanexampleof（）.答案:D.quantitativedata13、Incomeisanexampleof（）答案:A.avariablethatusestheratioscale;

D.quantitativedata14、Sinceasampleisasubsetofthepopulation,thesamplemean（）.答案:D.canbelarger,smaller,orequaltothemeanofthepopulation15、Inexperimentalstudies,thevariableofinterest（）.答案:B.iscontrolled16、Onastreet,thehousesarenumberedfrom300to450.Thehousenumbersareexamplesof（）.答案:A.categoricaldata17、Whichofthefollowingcanbeclassifiedasquantitativedata?答案:A.Theheightofabuilding,measuredinfeet.;

B.Theweightofacandybarinounces.;

C.Incomeindollars.18、Whichofthefollowingvariablesusetheintervalscaleofmeasurement?答案:B.temperature;

E.latitude19、Whichscaleofmeasurementcanbeeithernumericornonnumeric?答案:A.nominal;

D.ordinal20、Inaquestionnaire,respondentsareaskedtomarktheirgenderasmaleorfemale.Genderisan（）.答案:B.nominalscale;

C.categoricalvariable21、Arithmeticoperationsareappropriatefor（）答案:A.theratioscale;

B.theintervalscale;

D.quantitativedata22、Quantitativedatamaybeeithernumericornonnumeric.

答案:错误23、Inexperimentalstudies,thevariableofinterestiscontrolled.答案:正确24、Aportionofthepopulationselectedtorepresentthepopulationiscalledacensus.答案:错误25、Arithmeticoperationsareinappropriateforeithercategoricalorquantitativedata.答案:错误26、Ordinaryarithmeticoperationsaremeaningfuleitherwithquantitativeorcategoricaldata.答案:错误27、Anothernamefor“observations”iscases.答案:正确Chapter2DescriptiveStatistics：Summarizingdatausingtabularandgraphicaltechniquesquizzes21、Afrequencydistributionisatabularsummaryofdatashowingthe答案:numberofitemsinseveralclasses2、Afrequencydistributionis答案:atabularsummaryofasetofdatashowingthefrequencyofitemsineachofseveralnonoverlappingclasses3、Atabularsummaryofasetofdatashowingthefractionofthetotalnumberofitemsinseveralclassesisa答案:relativefrequencydistribution4、Therelativefrequencyofaclassiscomputedby答案:dividingthefrequencyoftheclassbythesamplesize5、Thepercentfrequencyofaclassiscomputedby答案:multiplyingtherelativefrequencyby1006、Thesumoffrequenciesforallclasseswillalwaysequal答案:thenumberofelementsinadataset7、FifteenpercentofthestudentsinaschoolofBusinessAdministrationaremajoringinEconomics,20%inFinance,35%inManagement,and30%inAccounting.Thegraphicaldevice(s)whichcanbeusedtopresentthesedatais(are)答案:bothabarchartandapiechart8、Acumulativerelativefrequencydistributionshows答案:theproportionofdataitemswithvalueslessthanorequaltotheupperlimitofeachclass9、Thesumoftherelativefrequenciesforallclasseswillalwaysequal答案:one10、Themostcommongraphicalpresentationofquantitativedataisa答案:histogram11、Thesumofthepercentfrequenciesforallclasseswillalwaysequal答案:10012、Therelativefrequencyofaclassiscomputedby答案:dividingthefrequencyoftheclassbyn13、Inconstructingafrequencydistribution,asthenumberofclassesaredecreased,theclasswidth答案:increases14、Inacumulativerelativefrequencydistribution,thelastclasswillhaveacumulativerelativefrequencyequalto答案:one15、Datathatprovidelabelsornamesforcategoriesoflikeitemsareknownas答案:categoricaldata16、Agraphicalpresentationoftherelationshipbetweentwovariablesis答案:ascatterdiagram17、Inascatterdiagram,alinethatprovidesanapproximationoftherelationshipbetweenthevariablesisknownas答案:trendline18、Whichofthefollowinggraphicalmethodsshowstherelationshipbetweentwovariables?答案:crosstabulation19、

Afrequencydistributionis答案:atabularsummaryofdatashowingthe

numberofitemsinseveralclasses;

atabularsummaryofasetofdatashowingthefrequencyofitemsineachofseveralnonoverlappingclasses20、1.

Therelativefrequencyofaclassiscomputedby答案:dividingthefrequencyoftheclassbythesamplesize;

dividingthefrequencyoftheclassbyn21、

Whichofthefollowingstatementsiscorrect？答案:InacuInacumulativepercentfrequencydistribution,thelastclasswillhaveacumulativepercentfrequencyequalto

100.;

Inacumulativerelativefrequencydistribution,thelastclasswillhaveacumulativerelativefrequencyequalto

one.;

Inacumulativefrequencydistribution,thelastclasswillalwayshaveacumulativefrequencyequalto

thetotalnumberofelementsinthedataset.22、WhichofthefollowingstatementsisNOTcorrect？答案:Ahistogramissaidtobeskewedtotheleftifithasa

shortertailtotheleft.;

Agraphicalpresentationoftherelationshipbetweentwovariablesis

ahistogram.;

Ahistogramis

agraphicalmethodofpresentingacumulativefrequencyoracumulativerelativefrequencydistribution.Chapter3DescriptiveStatistics：Summarizingdatausingnumericaltechniquesquizzes31、Geometricmeanisameasureof

答案:location2、GrowthfactorsforthepopulationofChattanoongainthepasttwoyearshasbeen8and12.

Thegeometricmeanhasavalueof

答案:squarerootof963、Geometricmeanoffiveobservationsis

答案:fifthrootoftheproductofthe5observations4、Thenthrootoftheproductofthenobservationsis答案:geometricmean5、Themeasureoflocationwhichisthemostlikelytobeinfluencedbyextremevaluesinthedatasetisthe答案:mean6、Iftwogroupsofnumbershavethesamemean,then答案:Noneofthesealternativesiscorrect.7、Themeanofthesample答案:Noneofthesealternativesiscorrect.8、Whenthesmallestandlargestpercentageofitemsareremovedfromadatasetandthemeaniscomputed,themeanoftheremainingdatais答案:thetrimmedmean9、Sincethepopulationisalwayslargerthanthesample,thevalueofthesamplemean答案:couldbelarger,equalto,orsmallerthanthetruevalueofthepopulationmean10、Whichofthefollowingprovidesameasureofcentrallocationforthedata?答案:mean11、Incomputingthemeanofasample,thevalueofåxi

isdividedby答案:n12、Anumericalvalueusedasasummarymeasureforasample,suchassamplemean,isknownasa答案:samplestatistic13、m

isanexampleofa答案:populationparameter14、Themeanofasample答案:iscomputedbysummingallthedatavaluesanddividingthesumbythenumberofitems15、Thecoefficientofvariationequals答案:30%16、Themedianisameasureof答案:centrallocation17、Thedifferencebetweenthelargestandthesmallestdatavaluesisthe答案:range18、Whichofthefollowingisameasureofdispersion?答案:interquartilerange19、Theinterquartilerangeis答案:thedifferencebetweenthethirdquartileandthefirstquartile20、Thevarianceofasampleof81observationsequals64.Thestandarddeviationofthesampleequals答案:821、Whichofthefollowingdon’tprovidesameasureofcentrallocationforthedata?答案:standardmedian;

variance;

range22、Whichofthefollowingisameasureofcentrallocation?答案:mean;

median;

mode23、Whichofthefollowingisameasureofdispersion?答案:standarddeviation;

range;

interquartilerange24、Whenthedataareskewedtotheright,themeasureofSkewnesswillbe

positive.答案:正确25、Whendataarepositivelyskewed,themeanwillusuallybe

smallerthanthemedian.答案:错误26、Incomputingdescriptivestatisticsfromgroupeddata,datavaluesaretreatedasiftheyoccuratthemidpointofaclass答案:正确27、Themeasureofdispersionthatisinfluencedmostbyextremevaluesis

theinterquartilerange.答案:错误28、Thedescriptivemeasureofdispersionthatisbasedontheconceptofadeviationaboutthemeanis

thestandarddeviation.答案:正确29、Thesamplevariance

couldbesmaller,equalto,orlargerthanthetruevalueofthepopulationvariance.答案:正确Chapter4ProbabilityandDistributionsquizzes41、Eachindividualoutcomeofanexperimentiscalled答案:asamplepoint2、Agraphicalmethodofrepresentingthesamplepointsofanexperimentis答案:atreediagram3、Anyprocessthatgenerateswell-definedoutcomesis答案:anexperiment4、Instatisticalexperiments,eachtimetheexperimentisrepeated答案:adifferentoutcomemayoccur5、ThecountingrulethatisusedforcountingthenumberofexperimentaloutcomeswhennobjectsareselectedfromasetofNobjectswhereorderofselection

isnot

importantiscalled答案:combination6、Fromagroupofsixpeople,twoindividualsaretobeselectedatrandom.Howmanypossibleselectionsarepossible?答案:157、Amethodofassigningprobabilitiesbaseduponjudgmentisreferredtoasthe答案:subjectivemethod8、Agraphicaldeviceusedforenumeratingsamplepointsinamultiple-stepexperimentisa答案:Noneofthesealternativesiscorrect.9、Twoeventsaremutuallyexclusive答案:iftheyhavenosamplepointsincommon10、Eventsthathavenosamplepointsincommonare答案:mutuallyexclusiveevents11、Initialestimatesoftheprobabilitiesofeventsareknownas答案:priorprobabilities12、Theadditionlawispotentiallyhelpfulwhenweareinterestedincomputingtheprobabilityof答案:theunionoftwoevents13、Thesumoftheprobabilitiesoftwocomplementaryeventsis答案:1.014、Thesetofallpossibleoutcomesofanexperimentis答案:thesamplespace15、Ifasixsideddieistossedtwotimesand“3”showsupbothtimes,theprobabilityof“3”onthethirdtrialis答案:1/616、GiventhateventEhasaprobabilityof0.31,theprobabilityofthecomplementofeventE答案:0.6917、Bayes’theoremisusedtocompute答案:theposteriorprobabilities18、Themultiplicationlawispotentiallyhelpfulwhenweareinterestedincomputingtheprobabilityof答案:theintersectionoftwoevents19、IfP(A)=0.5andP(B)=0.5,thenP(AÇ

B)答案:Noneofthesealternativesiscorrect.20、Alotteryisconductedusingthreeurns.Eachurncontainschipsnumberedfrom0to9.Onechipisselectedatrandomfromeachurn.Thetotalnumberofsamplepointsinthesamplespaceis答案:1,00021、AnexperimentconsistsoffouroutcomeswithP(E1)=0.2,P(E2)=0.3,andP(E3)=0.4.TheprobabilityofoutcomeE4

is答案:0.10022、Thesetofallpossiblesamplepoints(experimentaloutcomes)iscalled答案:thesamplespace23、

EventsAandBaremutuallyexclusiveiftheirjointprobabilityis

zero.答案:正确24、Iftwoeventsaremutuallyexclusive,thentheirintersectioncanhaveanyvaluelargerthanzero.答案:错误25、Amethodofassigningprobabilitieswhichassumesthattheexperimentaloutcomesareequallylikelyisreferredtoasthe

classicalmethod.答案:正确26、Amethodofassigningprobabilitiesbasedonhistoricaldataiscalledthe

historicalmethod.答案:错误27、Theprobabilityassignedtoeachexperimentaloutcomemustbebetweenzeroandone.答案:正确28、Ameasureoftheaveragevalueofarandomvariableiscalleda(n)

expectedvalue.答案:正确Chapter5SurveySamplingquizzes51、Parametersare答案:numericalcharacteristicsofapopulation2、Asimplerandomsampleof100observationswastakenfromalargepopulation.Thesamplemeanandthestandarddeviationweredeterminedtobe80and12respectively.Thestandarderrorofthemeanis答案:1.203、Apopulationhasastandarddeviationof16.Ifasampleofsize64isselectedfromthispopulation,whatistheprobabilitythatthesamplemeanwillbewithin±2ofthepopulationmean?答案:0.68264、Conveniencesamplingisanexampleof答案:nonprobabilisticsampling5、Whichofthefollowingisanexampleofnonprobabilisticsampling?答案:judgmentsampling6、Stratifiedrandomsamplingisamethodofselectingasampleinwhich答案:thepopulationisfirstdividedintostrata,andthenrandomsamplesaredrawnfromeachstratum7、Apopulationconsistsof500elements.Wewanttodrawasimplerandomsampleof50elementsfromthispopulation.Onthefirstselection,theprobabilityofanelementbeingselectedis答案:0.0028、Asthesamplesizeincreases,the答案:standarderrorofthemeandecreases9、Ifweconsiderthesimplerandomsamplingprocessasanexperiment,thesamplemeanis答案:arandomvariable10、Asthesamplesizebecomeslarger,thesamplingdistributionofthesamplemeanapproachesa答案:normaldistribution11、Thestandarddeviationofasampleof100elementstakenfromaverylargepopulationisdeterminedtobe60.Thevarianceofthepopulation答案:canbeanyvaluegreaterorequaltozero12、Aprobabilitydistributionforallpossiblevaluesofasamplestatisticisknownas答案:asamplingdistribution13、Apopulationhasameanof300an