雨课堂学堂在线学堂云Applied Statistics(上海第二工业大学)单元测试考核答案

第1题TrueorFalse:Studentgrades(AtoF)areanexampleofcontinuousnumericaldata.()第2题TrueorFalse:Acontinuousvariablemaytakeonanyvaluewithinitsrelevantrangeeventhoughthemeasurementdevicemaynotbepreciseenoughtorecordit.()第3题TrueorFalse:Thepossibleresponsestothequestion"Howlonghaveyoubeenlivingatyourcurrentresidence?"arevaluesfromacontinuousvariable.()第4题TrueorFalse:Problemsmayarisewhenstatisticallyunsophisticateduserswhodonotunderstandtheassumptionsbehindthestatisticalproceduresortheirlimitationsaremisledbyresultsobtainedfromcomputersoftware.()第5题TrueorFalse:Apopulationisthetotalityofitemsorthingsunderconsideration.()第6题5.Aninsurancecompanyevaluatesmanynumericalvariablesaboutapersonbeforedecidingonanappropriaterateforautomobileinsurance.Howlongapersonhasbeenalicenseddriverisanexampleofa____numericalvariable.正确答案：:continuous第7题4.TheCommissionerofHealthinNewYorkStatewantedtostudymalpracticelitigationinNewYork.Asampleof31thousandmedicalrecordswasdrawnfromapopulationof2.7millionpatientswhoweredischargedduring2010.Usingtheinformationobtainedfromthesampletopredictpopulationcharacteristicswithrespecttomalpracticelitigationisanexampleof____正确答案：:inferentialstatistics第8题3.Theorangesgrownoncorporatefarmsinanagriculturalstateweredamagedbysomeunknownfungiafewyearsago.Supposethemanagerofalargefarmwantedtostudytheimpactofthefungiontheorangecropsonadailybasisoverasix-weekperiod.Oneachdayarandomsampleoforangetreeswasselectedfromwithinarandomsampleofacres.Thedailyaveragenumberofdamagedorangespertreeandtheproportionoftreeshavingdamagedorangeswerecalculated.Inthisstudy,thepresentationandcharacterizationofthetwomainmeasurescalculatedeachday(i.e.,averagenumberofdamagedorangespertreeandproportionoftreeshavingdamagedoranges)iscalled____.正确答案：:descriptivestatistics第9题2.TheHumanResourcesDirectorofalargecorporationwishestodevelopanemployeebenefitspackageanddecidestoselect500employeesfromalistofall(N=40,000)workersinordertostudytheirpreferencesforthevariouscomponentsofapotentialpackage.Inthisstudy,methodsinvolvingthecollection,presentation,andcharacterizationofthedataarecalled____.正确答案：:descriptivestatistics第10题1.TheHumanResourcesDirectorofalargecorporationwishestodevelopanemployeebenefitspackageanddecidestoselect500employeesfromalistofall(N=40,000)workersinordertostudytheirpreferencesforthevariouscomponentsofapotentialpackage.Alltheemployeesinthecorporationconstitutethe____.正确答案：:population第11题Asummarymeasurethatiscomputedtodescribeacharacteristicofanentirepopulationiscalled()Aaparameter.Bacensus.Castatistic.Dthescientificmethod.第12题Asummarymeasurethatiscomputedtodescribeacharacteristicfromonlyasampleofthepopulationiscalled()Aaparameter.Bacensus.Castatistic.Dthescientificmethod.第13题Theportionoftheuniversethathasbeenselectedforanalysisiscalled()Aasample.Baframe.Caparameter.Dastatistic.第14题Theuniverseor"totalityofitemsorthings"underconsiderationiscalled()Aasample.Bapopulation.Caparameter.Dastatistic.第15题Theestimationofthepopulation'saveragefamilyexpenditureonfoodbasedonthesampleaverageexpenditureof1,000familiesisanexampleof()Ainferentialstatistics.Bdescriptivestatistics.Caparameter.Dastatistic.第16题Thecollectionandsummarizationofthesocioeconomicandphysicalcharacteristicsoftheemployeesofaparticularfirmisanexampleof()Ainferentialstatistics.Bdescriptivestatistics.Caparameter.Dastatistic.第17题AstudyisunderwayinYosemiteNationalForesttodeterminetheheightofadultAmericanpinetrees.Specifically,thestudyisattemptingtodeterminewhatfactorsaidatreeinreachingheightsgreaterthan60feettall.Itisestimatedthattheforestcontains25,000adultAmericanpines.Thestudyinvolvescollectingheightsfrom250randomlyselectedadultAmericanpinetreesandanalyzingtheresults.Identifythesampleinthestudy.()Athe250randomlyselectedadultAmericanpinetreesBthe25,000adultAmericanpinetreesintheforestCalltheadultAmericanpinetreestallerthan60feetDallAmericanpinetrees,ofanyage,intheforest第18题Whichofthefollowingismostlikelyaparameterasopposedtoastatistic?()AtheaveragescoreofthefirstfivestudentscompletinganassignmentBtheproportionoffemalesregisteredtovoteinacountyCtheaverageheightofpeoplerandomlyselectedfromadatabaseDtheproportionoftrucksstoppedyesterdaythatwerecitedforbadbrakes第19题Theprocessofusingdatacollectedfromasmallgrouptoreachconclusionsaboutalargegroupiscalled()Astatisticalinference.Bthescientificmethod.Csampling.Ddescriptivestatistics.第20题Thosemethodsinvolvingthecollection,presentation,andcharacterizationofasetofdatainordertoproperlydescribethevariousfeaturesofthatsetofdataarecalled()Astatisticalinference.Bthescientificmethod.Csampling.Ddescriptivestatistics.第1题ReferringtoTable2-5,whatisthewidthofeachclass?()A1minuteB5minutesC2%D100%第2题ReferringtoTable2-5,if1,000callswererandomlysampled,howmanycallslastedunder10minutes?()A220B370C410D590第3题ReferringtoTable2-5,if100callswererandomlysampled,howmanycallslasted15minutesorlonger?()A10B14C26D74第4题ReferringtoTable2-5,if10callslasted30minutesormore,howmanycallslastedlessthan5minutes?()A10B185C295D500第5题ReferringtoTable2-5,whatisthecumulativerelativefrequencyforthepercentageofcallsthatlastedunder20minutes?()A0.10B0.59C0.76D0.84第6题Youcanconstructa____tabletoorganizethedatafromtwoormorecategoricalvariables.正确答案：:contingency第7题A____presentstalliedresponsesasfrequenciesorpercentagesforeachcategory.正确答案：:summarytable第8题An____arrangesthevaluesofanumericalvariableinrankorder.正确答案：:orderedarray第9题TrueorFalse:

Asummarytableallowsyoutostudypatternsthatmayexistbetweentheresponsesoftwoormorecategoricalvariables.()第10题TrueorFalse:

Afrequencydistributionsummarizesnumericalvaluesbytallyingthemintoasetofnumericallyorderedclasses.()第11题TrueorFalse:

Todeterminetheclassintervalwidth,yousubtractthehighest

valuefromthelowestvalueanddividethatresultbythenumberofclassesyouwantyourfrequencydistributiontohave.()

第12题TrueorFalse:Thesumofrelativefrequenciesinadistributionalwaysequals1.()第13题TrueorFalse:Ingeneral,groupedfrequencydistributionsshouldhavebetween5and15classintervals.()第14题Inthetable,intersectionsoftherowsandcolumnsarecalled____.正确答案：:cells第15题Wecanvisualizethedatabydeveloping____.正确答案：:charts第16题Whichofthefollowingsourcecancollectprimarydata?()AaconsultationreportBaquestionnaireCsalesreportofonesmallfirmDpersonnelinformationfromtheHRdepartment第17题Inmosttime,wewilluse()toorganizedata?AchartBtableCgraphDbar第18题InacronymDCOVA,whatdoes"D"mean?()ADefineBDefinitionCDoDDeliver第19题AstudyattemptedtoestimatetheproportionofFloridaresidentswhowerewillingtospendmoretaxdollarsonprotectingthebeachesfromenvironmentaldisasters.Twenty-fivehundredFloridaresidentsweresurveyed.Whattypeofdatacollectionprocedurewasmostlikelyusedtocollectthedataforthisstudy?()AadesignedexperimentBapublishedsourceCarandomsampleDobservationaldata第20题TheBritishAirwaysInternetsiteprovidesaquestionnaireinstrumentthatcanbeansweredelectronically.Whichofthefourmethodsofdatacollectionisinvolvedwhenpeoplecompletethequestionnaire?()ApublishedsourcesBexperimentationCsurveyingDobservationChap02-2Exercise第1题ReferringtothehistogramfromTable2-3,howmanygraduatingseniorsattendedtheluncheonintheclass"0",class"1"andclass"2"?()A4B152C254D388第2题ReferringtoTable2-18,____studentshaveasatisfactionlevelofatleast80?——FillinArabicnumerals正确答案：:15第3题ReferringtoTable2-4,whatpercentageoftherespondentsratedoveralltelevisionqualitywitharatingof80orabove?()A0B4C96D100第4题ReferringtoTable2-5,if1,000callswererandomlysampled,howmanycallslastedunder10minutes?()A220B370C410D590第5题ReferringtoTable2-17,amongthe8stores,____sawasalesdecline.正确答案：:GapandTalbots第6题ReferringtoTable2-14,ifthesampleisagoodrepresentationofthepopulation,wecanexpect____%ofthemalesinthepopulationwillownaportableDVD.正确答案：:30第7题ReferringtoTable2-14,____%ofthe600werefemales.——Keep2decimalplaces正确答案：:46.67第8题ReferringtoTable2-13,ifarelativefrequencyorpercentagedistributionforthedetergentdataisconstructed,using"9.0butlessthan10.0gallons"asthefirstclass,____%ofdrive-throughcarwashoperationsuseatleast10gallonsofdetergentinaday?正确答案：:88第9题TrueorFalse:Givenbelowisthescatterplotofthenumberofemployeesandthetotalrevenue($millions)of20U.S.companies.Companiesthathavehighernumbersofemployeesappeartoalsohavehighertotalrevenue.()第10题TrueorFalse:Givenbelowisthescatterplotofthemarketvalue(thousands)andprofit(thousands)of50U.S.companies.Thereappearstobeanegativerelationshipbetweenmarketvalueandprofit.()第11题TrueorFalse:Givenbelowisthescatterplotoftheprice/earningsratioversusearningspershareof20U.S.companies.Thereappeartobeapositiverelationshipbetweenprice/earningsratioandearningspershare.()第12题TrueorFalse:ReferringtoTable2-18,ifastudentisrandomlyselected,his/hermostlikelylevelofsatisfactionamongthe40s,50s,60s,70s,80sand90swillbeinthe60s.()第13题TrueorFalse:ReferringtoTable2-18,thelevelofsatisfactionisconcentratedaround75.()第14题YouhavecollectedinformationonthemarketshareoffivedifferentsearchenginesusedbyU.S.InternetusersinJanuary2011.Whichofthefollowingisthebestforpresentingtheinformation?()AapiechartBahistogramCastem-and-leafdisplayDacontingencytable第15题Whenstudyingthesimultaneousresponsestotwocategoricalquestions,youshouldsetupa()Acontingencytable.Bfrequencydistributiontable.Ccumulativepercentagedistributiontable.Dhistogram.第16题Whichofthefollowingisappropriatefordisplayingdatacollectedonthedifferentbrandsofcarsthatstudentsatamajoruniversitydrive?()AaParetochartBatwo-wayclassificationtableCahistogramDascatterplot第17题Whenconstructingcharts,thefollowingisplottedattheclassmidpoints:()Afrequencyhistograms.Bpercentagepolygons.Ccumulativepercentagepolygon(ogives).Dalloftheabove第18题Whenpolygonsorhistogramsareconstructed,whichaxismustshowthetruezeroor"origin"?()AthehorizontalaxisBtheverticalaxisCboththehorizontalandverticalaxesDneitherthehorizontalnortheverticalaxis第19题Thewidthofeachbarinahistogramcorrespondstothe()Apercentageofobservationsineachclass.Bnumberofobservationsineachclass.Cmidpointofeachclass.Ddifferencesbetweentheboundariesoftheclass.第20题Atypeofverticalbarchartinwhichthecategoriesareplottedinthedescendingrankorderofthemagnitudeoftheirfrequenciesiscalleda()AParetochart.Bcontingencytable.Cstem-and-leafdisplay.Dpiechart.Chap03-1Exercise第1题ReferringtoTable3-1,determinewhichofthefollowingisthecorrectstatement.()AOne-fourthoftheseniorcitizenssampledarebelow65.5yearsofage.BThemiddle50%oftheseniorcitizenssampledarebetween65.5and73.0yearsofage.CThemeanageofseniorcitizenssampledis73.5yearsofage.DAlloftheabovearecorrect.第2题ReferringtoTable3-2,themodecarbohydratesinthissampleis____grams.正确答案：:15第3题ReferringtoTable3-2,therangeinthecarbohydrateamountsis____grams.正确答案：:18第4题ReferringtoTable3-3,thearithmeticmeanofthenumberofvitaminsupplementssoldinthissampleis____.正确答案：:28第5题ReferringtoTable3-2,themediancarbohydrateamountinthecerealis____grams.正确答案：:20第6题TrueorFalse:Thecoefficientofvariationisameasureofrelativevariation.()第7题TrueorFalse:Ifasetofdataisperfectlysymmetrical,thearithmeticmeanmustbeidenticaltothemedian.()第8题TrueorFalse:Themedianisameasureofvariationordispersioninasetofdata.()第9题TrueorFalse:Thecoefficientofvariationisameasureofcentraltendencyinthedata.()第10题TrueorFalse:Thecoefficientofvariationmeasuresvariabilityinadatasetrelativetothesizeofthearithmeticmean.()第11题TrueorFalse:Themedianofadatasetwith20itemswouldbetheaverageofthe10thandthe11thitemsintheorderedarray.()第12题TrueorFalse:Apopulationwith200elementshasanarithmeticmeanof10.Fromthisinformation,itcanbeshownthatthepopulationstandarddeviationis15.()第13题TrueorFalse:Inasampleofsize40,thesamplemeanis15.Inthiscase,thesumofallobservationsinthesampleisΣXi=600.()第14题TrueorFalse:Themedianofthevalues3.4,4.7,1.9,7.6,and6.5is4.05.()第15题TrueorFalse:Themedianofthevalues3.4,4.7,1.9,7.6,and6.5is1.9.()第16题Ifthearithmeticmeanofanumericaldatasetisgreaterthanthemedian,thedataareconsideredtobe____-skewed.正确答案：:right第17题Thefollowingsetofdataisfromasampleofn=7:7,4,9,7,3,12,9.Whatisthemodeofthedata-set?()A7B9C7,9D3第18题Thefollowingsetofdataisfromasampleofn=7:7,4,9,7,3,12,9.Whatisthemedianofthedata-set?()A7B3C9D5第19题Whichofthefollowingistheeasiesttocompute?()AthearithmeticmeanBthemedianCthemodeDthestandarddeviation第20题Inaperfectlysymmetricalbell-shaped"normal"distribution,().Athearithmeticmeanequalsthemedian.Bthemedianequalsthemode.Cthearithmeticmeanequalsthemode.Dalltheabove第21题WhichofthefollowingstatementsaboutthemedianisNOTtrue?()AItismoreaffectedbyextremevaluesthanthearithmeticmean.BItisameasureofcentraltendency.CItisequaltoQ2.DItisequaltothemodeinbell-shaped"normal"distributions.第22题Inaleft-skeweddistribution,()Athemedianequalsthearithmeticmean.Bthemedianislessthanthearithmeticmean.Cthemedianisgreaterthanthearithmeticmean.Dnoneoftheabove第23题Whichofthearithmeticmean,median,andmodeareresistantmeasuresofcentraltendency?()AthearithmeticonlyBthemedianonlyCthemodemeanonlyDthemedianandmodeonly第24题Whichmeasureofcentraltendencycanbeusedforbothnumericalandcategoricalvariables?()AarithmeticmeanBmedianCmodeDstandarddeviation第25题WhichofthefollowingstatisticsisNOTameasureofcentraltendency?()AarithmeticmeanBmedianCrangeDmodeChap03-2Exercise第1题Amanufacturerofflashlightbatteriestookasampleof130batteriesfromaday'sproductionandusedthemcontinuouslyuntiltheyweredrained.Thenumberofhoursuntilfailurewererecorded.Givenbelowistheboxplotofthenumberofhoursittooktodraineachofthe130batteries.Thedistributionofthenumberofhoursis()Aright-skewed.Bleft-skewed.Csymmetrical.Dnoneoftheabove第2题ReferringtoTable3-1,identifywhichofthefollowingisthecorrectstatement.()AOne-fourthoftheseniorcitizenssampledarebelow64yearsofage.BThemiddle50%oftheseniorcitizenssampledarebetween65.5and73.0yearsofage.C25%oftheseniorcitizenssampledareolderthan81.5yearsofage.DAlloftheabovearecorrect.第3题ReferringtoTable3-10,fortheweekwhentheDJIAishigh,youwillexpecttheS&Pindexinthatweekto()AbeaboutthesamevalueastheDJIA.Bbelow.Cbehigh.DhavenorelationshipwiththeDJIAvalue.第4题ReferringtoTable3-11,foralaptopcomputerthathasahighrating,youwillexpectitsperformancescoreto()Abeaboutthesameasitsrating.Bbelow.Cbehigh.Dhavenorelationshipwithitsrating.第5题ReferringtoTable3-12,howwillyouclassifythelinearrelationshipbetweentheexamscoresandthenumberofenergydrinksconsumed?()AweakBmoderateCstrongDnorelationship第6题TrueorFalse:Asageneralrule,avalueisconsideredanextremevalueifitsZscoreislessthan3.()第7题TrueorFalse:TheZscoreofavaluecanneverbenegative.()第8题TrueorFalse:Theinterquartilerangeisameasureofvariationordispersioninasetofdata.()第9题TrueorFalse:Thelinedrawnwithintheboxoftheboxplotalwaysrepresentsthearithmeticmean.()第10题TrueorFalse:Inaboxplot,theboxportionrepresentsthedatabetweenthefirstandthirdquartilevalues.()第11题TrueorFalse:Thefive-numbersummaryconsistsofthesmallestvalue,thefirstquartile,themedian,thethirdquartile,andthelargestvalue.()第12题TrueorFalse:Aboxplotisagraphicalrepresentationofafive-numbersummary.()第13题Whichofthefollowingissensitivetoextremevalues?()AthemedianBtheinterquartilerangeCthearithmeticmeanDthe1stquartile第14题AccordingtotheChebyshevrule,atleast75%ofallobservationsinanydatasetarecontainedwithinadistanceofhowmanystandarddeviationsaroundthemean?()A1B2C3D4第15题Accordingtotheempiricalrule,ifthedataforma"bell-shaped"normaldistribution,________percentoftheobservationswillbecontainedwithin2standarddeviationsaroundthearithmeticmean.()A68.26B88.89C93.75D95.44第16题Inperfectlysymmetricaldistributions,whichofthefollowingisNOTacorrectstatement?()AThedistancefromQ1toQ2equalstothedistancefromQ2toQ3.BThedistancefromthesmallestobservationtoQ1isthesameasthedistancefromQ3tothelargestobservation.CThedistancefromthesmallestobservationtoQ2isthesameasthedistancefromQ2tothelargestobservation.DThedistancefromQ1toQ3ishalfofthedistancefromthesmallesttothelargestobservation.第17题Inright-skeweddistributions,whichofthefollowingisthecorrectstatement?()AThedistancefromQ1toQ2isgreaterthanthedistancefromQ2toQ3.BThedistancefromQ1toQ2islessthanthedistancefromQ2toQ3.CThearithmeticmeanislessthanthemedian.DThemodeisgreaterthanthearithmeticmean.第18题Whichdescriptivesummarymeasuresareconsideredtoberesistantstatistics?()AthearithmeticmeanandstandarddeviationBtheinterquartilerangeandrangeCthemodeandvarianceDthemedianandinterquartilerange第19题Thesmallerthespreadofscoresaroundthearithmeticmean,()Athesmallertheinterquartilerange.Bthesmallerthestandarddeviation.Cthesmallerthecoefficientofvariation.Dalltheabove第20题Ingeneral,whichofthefollowingdescriptivesummarymeasurescannotbeeasilyapproximatedfromaboxplot?()AthevarianceBtherangeCtheinterquartilerangeDthemedian第21题Whenextremevaluesarepresentinasetofdata,whichofthefollowingdescriptivesummarymeasuresaremostappropriate?()ACVandrangeBarithmeticmeanandstandarddeviationCinterquartilerangeandmedianDvarianceandinterquartilerangeChap04Exercise第1题Asurveyofbanksrevealedthefollowingdistributionfortheinterestratebeingchargedonahomeloan(basedona30-yearmortgagewitha10%downpayment).Ifabankisselectedatrandomfromthisdistribution,whatisthechancethattheinterestratechargedonahomeloanwillexceed5.19%?()A0.06B0.41C0.59D1.00第2题AccordingtoasurveyofAmericanhouseholds,theprobabilitythattheresidentsowntwocarsifannualhouseholdincomeisover$50,000is80%.

Ofthehouseholdssurveyed,60%hadincomesover$50,000and70%

hadtwocars.Theprobabilitythattheresidentsofahouseholdowntwocarsandhaveanincomeover$50,000ayearis()A0.12B0.18C0.22D0.48第3题ReferringtoTable4-1,whatproportionofaccidentsinvolvedmorethanonevehicle?()A50/400or12.5%B75/400or18.75%C275/400or68.75%D325/400or81.25%第4题ReferringtoTable4-2,whatistheprobabilitythatarandomlyselectedstudentwhowentbarhoppingdidwellonthemidterm?()A30/100or30%B30/110or27.27%C30/200or15%D(100/200)*(110/200)or27.50%第5题ReferringtoTable4-2,whatistheprobabilitythatarandomlyselectedstudentdidwellonthemidtermandalsowentbarhoppingtheweekendbeforethemidterm?()A30/200or15%B(80+30)/200or55%C(30+70)/200or50%D(80+30+70)/200or90%第6题ReferringtoTable4-1,giventhatmultiplevehicleswereinvolved,whatproportionofaccidentsinvolvedalcohol?()A120/170or70.59%B120/230or52.17%C120/325or36.92%D120/400or30%第7题AccordingtoasurveyofAmericanhouseholds,theprobabilitythattheresidentsowntwocarsifannualhouseholdincomeisover$50,000is80%.

Ofthehouseholdssurveyed,60%hadincomesover$50,000and70%

hadtwocars.Theprobabilitythatannualhouseholdincomeisover$50,000iftheresidentsofahouseholdowntwocarsis________.()A0.42B0.48C0.50D0.69第8题TrueorFalse:ReferringtoTable4-4,thetwoevents"preferringwater"and"preferringsoda"areindependent.()第9题TrueorFalse:IfP(AorB)=1.0,thenAandBmustbecollectivelyexhaustive.()第10题TrueorFalse:IfeitherAorBmustoccurtheeventsarecalledcollectivelyexhaustive.()第11题TrueorFalse:Aninvestmentconsultantisrecommendingacertainclassofmutualfundstoclientsbasedonitsexceptionallyhighprobabilityofgain.Itisanunethicalpracticenottoalsorecommendaclassofmutualfundswithanexceptionallyhighprobabilityofloss.()第12题TrueorFalse:Aninvestmentconsultantisrecommendingacertainclassofmutualfundstoclientsbasedonitsexceptionallyhighprobabilityofexceptionallyhighgain.Itisanunethicalpracticetotellclientstheprobabilityofalossinherrecommendations.()第13题TrueorFalse:Toethicallyadvertiseaschoollotteryschemetotrytoraisemoneyfortheathleticdepartment,theorganizerofthelotterydoesnotneedtoexplicitlyspecifytheprobabilityofeachoftheprizeinthelottery.()第14题TrueorFalse:IfP(AandB)=0,thenAandBmustbecollectivelyexhaustive.()第15题TrueorFalse:IfP()=0.4andP()=0.6,thenAandBmustbecollectivelyexhaustive.()第16题TrueorFalse:IfeitherAorBmustoccurtheeventsarecalledmutuallyexclusive.()第17题TrueorFalse:WhenAandBaremutuallyexclusive,P(AorB)canbefoundbyaddingP()andP().()第18题Theclosingpriceofacompany'sstocktomorrowcanbelower,higherorthesameastoday'sclosingprice.Withoutanypriorinformationthatmayaffectthepriceofthestocktomorrow,theprobabilitythatitwillclosehigherthantoday'scloseis1/3.Thisisanexampleofusingwhichofthefollowingprobabilityapproach?()AaprioriprobabilityBempiricalprobabilityCsubjectiveprobabilityDconditionalprobability第19题Acompanyhastwomachinesthatproducewidgets.Anoldermachineproduces23%defectivewidgets,whilethenewmachineproducesonly8%defectivewidgets.Inaddition,thenewmachineproducesthreetimesasmanywidgetsastheoldermachinedoes.Giventhatawidgetwasproducedbythenewmachine,whatistheprobabilityitisnotdefective?()A0.06B0.50C0.92D0.94第20题Theprobabilitythatanewadvertisingcampaignwillincreasesalesisassessedasbeing0.80.Theprobabilitythatthecostofdevelopingthenewadcampaigncanbekeptwithintheoriginalbudgetallocationis0.40.Assumingthatthetwoeventsareindependent,theprobabilitythatthecostiskeptwithinbudgetandthecampaignwillincreasesalesis________.()A0.20B0.32C0.40D0.88第21题Theprobabilitythathousesaleswillincreaseinthenext6monthsisestimatedtobe0.25.Theprobabilitythattheinterestratesonhousingloanswillgoupinthesameperiodisestimatedtobe0.74.Theprobabilitythathousesalesorinterestrateswillgoupduringthenext6monthsisestimatedtobe0.89.Theprobabilitythatbothhousesalesandinterestrateswillincreaseduringthenext6monthsis________.()A0.10B0.185C0.705D0.90第22题Theemployeesofacompanyweresurveyedonquestionsregardingtheireducationalbackground(collegedegreeornocollegedegree)andmaritalstatus(singleormarried).Ofthe600employees,400hadcollegedegrees,100weresingle,and60weresinglecollegegraduates.Theprobabilitythatanemployeeofthecompanyissingleorhasacollegedegreeis________.()A0.10B0.25C0.667D0.733第23题Abusinessventurecanresultinthefollowingoutcomes(withtheircorrespondingchanceofoccurringinparentheses):HighlySuccessful(10%),Successful(25%),BreakEven(25%),Disappointing(20%),andHighlyDisappointing(?).Ifthesearetheonlyoutcomespossibleforthebusinessventure,whatisthechancethatthebusinessventurewillbeconsideredHighlyDisappointing?()A10%B15%C20%D25%第24题Whenusingthegeneralmultiplicationrule,P(AandB)isequalto()AP(A|B)P(B).BP(A)P(B).CP(B)/P(A).DP(A)/P(B).第25题Thecollectionofallpossibleeventsiscalled()Aasimpleprobability.Basamplespace.Cajointprobability.Dthenullset.第26题Iftwoeventsareindependent,whatistheprobabilitythattheybothoccur?()A0B0.50C1.00Dcannotbedeterminedfromtheinformationgiven第27题IftwoequallylikelyeventsAandBaremutuallyexclusiveandcollectivelyexhaustive,whatistheprobabilitythateventAoccurs?()A0.B0.50C1.00Dcannotbedeterminedfromtheinformationgiven第28题Iftwoeventsaremutuallyexclusiveandcollectivelyexhaustive,whatistheprobabilitythatoneortheotheroccurs?()A0B0.50C1.00Dcannotbedeterminedfromtheinformationgiven第29题Iftwoeventsaremutuallyexclusive,whatistheprobabilitythatbothoccuratthesametime?()A0B0.50C1.00Dcannotbedeterminedfromtheinformationgiven第30题Iftwoeventsarecollectivelyexhaustive,whatistheprobabilitythatbothoccuratthesametime?()A0B0.50C1.00DcannotbedeterminedfromtheinformationgivenChap05Exercise第1题ReferringtoTable5-1,theprobabilitythatbothsoundanalarminthepresenceofsmokeis____.——keep2decimalplaces正确答案：:0.64第2题IfXhasabinomialdistributionwithn=4andp=0.3,thenP(X=1)=____.——keep4decimalplaces正确答案：:0.4116第3题ReferringtoTable5-2,theprobabilitythatallthreebusinessessucceedis____.——keep3decimalplaces正确答案：:0.216第4题ReferringtoTable5-3,theprobabilityofnoretransmissionsis____.——keep2decimalplaces正确答案：:0.35第5题TrueorFalse:Thenumberofcustomersarrivingatadepartmentstoreinafive-minuteperiodhasabinomialdistribution.()第6题TrueorFalse:Th