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Ch.1 IntroductiontoStatistics 1.1 AnOverviewofStatistics 1 DistinguishBetweenaPopulationandaSample MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Determinewhetherthedatasetisapopulationorasample. 1) Theageofeveryfourthpersonenteringadepartmentstore A) sample B) population 2) Theageofeachemployeeatalocalgrocerystore A) population B) sample SHORTANSWER.Writethewordorphrasethatbestcompleteseachstatementoranswersthequestion. Identifythepopulationandthesample. 3) Asurveyof1782Americanhouseholdsfoundthat80%ofthehouseholdsownacomputer. 4) When1886Americanhouseholdsweresurveyed,itwasfoundthat85%ofthemownedtwocars. 5) Asurveyof2625elementaryschoolchildrenfoundthat28%ofthechildrencouldbeclassifiedasobese. MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. UsetheVenndiagramtoidentifythepopulationandthesample. 6) A) Population:Magazinesubscribers;Sample;Magazinesubscriberswhorenewtheirsubscription B) Population:Magazinesubscriberswhorenewtheirsubscription;Sample:Magazinesubscribers 2 DistinguishBetweenaParameterandaStatistic SHORTANSWER.Writethewordorphrasethatbestcompleteseachstatementoranswersthequestion. Determinewhetherthenumericalvalueisaparameterorastatistic.Explainyourreasoning. 1) […]

Ch.2 DescriptiveStatistics 2.1 FrequencyDistributionsandTheirGraphs 1 InterpretaFrequencyDistribution MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Usethegivenfrequencydistributiontofindthe (a)classwidth. (b)classmidpointsofthefirstclass. (c)classboundariesofthefirstclass. 1) Height(ininches) Class Frequency,f 50–52 5 53–55 8 56–58 12 59–61 13 62–64 11 A) (a)3 (b)51 (c)49.5–52.5 B) (a)2 (b)51.5 (c)49.5–52.5 C) (a)3 (b)51 (c)50–52 D) (a)2 (b)51.5 […]

Ch.3 Probability 3.1 BasicConceptsofProbabilityandCounting 1 FindProbabilities MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Acoinistossed.Findtheprobabilitythattheresultisheads. A) 0.5 B) 0.1 C) 0.9 D) 1 2) Asinglesix–sideddieisrolled.Findtheprobabilityofrollinganumberlessthan3. A) 0.333 B) 0.1 C) 0.5 D) 0.25 3) Asinglesix–sideddieisrolled.Findtheprobabilityofrollingaseven. A) 0 B) 0.1 C) 0.5 D) 1 4) Astudyof1000randomlyselectedflightsofamajorairlineshowedthat798 […]

Ch.4 DiscreteProbabilityDistributions 4.1 ProbabilityDistributions 1 DecideifaRandomVariableisDiscreteorContinuous MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Statewhetherthevariableisdiscreteorcontinuous. Thenumberofcupsofcoffeesoldinacafeteriaduringlunch A) discrete B) continuous 2) Statewhetherthevariableisdiscreteorcontinuous. Theheightofaplayeronabasketballteam A) continuous B) discrete 3) Statewhetherthevariableisdiscreteorcontinuous. ThecostofaStatisticstextbook A) discrete B) continuous 4) Statewhetherthevariableisdiscreteorcontinuous. Thebloodpressuresofagroupofstudentsthedaybeforetheirfinalexam A) continuous B) discrete 5) Statewhetherthevariableisdiscreteorcontinuous. ThetemperatureindegreesFahrenheitonJuly4thinJuneau,Alaska A) […]

Ch.5 NormalProbabilityDistributions 5.1 IntroductiontoNormalDistributionsandtheStandardNormalDistributio n 1 FindAreasUndertheStandardNormalCurve MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Findtheareaoftheindicatedregionunderthestandardnormalcurve. A) 0.0968 B) 0.9032 C) 0.4032 D) 0.0823 2) Findtheareaoftheindicatedregionunderthestandardnormalcurve. A) 0.9032 B) 0.0968 C) 0.0823 D) 0.9177 3) Findtheareaoftheindicatedregionunderthestandardnormalcurve. A) 0.6562 B) 1.309 C) 0.3438 D) 0.309 4) […]

Ch.6 ConfidenceIntervals 6.1 ConfidenceIntervalsfortheMean(σKnown) 1 FindaCriticalValue MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Findthecriticalvaluezcthatcorrespondstoa94%confidencelevel. A) ±1.88 B) ±1.645 C) ±1.96 D) ±2.33 2 FindtheMarginofError MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Determinethesamplingerrorifthegradepointaveragesfor10randomlyselectedstudentsfromaclassof125 studentshasameanofx=2.8.Assumethegradepointaverageofthe125studentshasameanof μ=3.5. A) 0.7 B) 3.15 C) –0.7 D) 2.45 2) Findthemarginoferrorforthegivenvaluesofc,σ,andn. c=0.90,σ=11.5,n=120 A) 1.73 B) […]

Ch.7 HypothesisTestingwithOneSample 7.1 IntroductiontoHypothesisTestin g 1 IntroductiontoHypothesisTesting MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Thestatementrepresentsaclaim.WriteitscomplementandstatewhichisH0andwhichisHA. μ=8.3 A) H0:μ=8.3(claim);Ha:μ≠8.3 B) H0:μ ≠8.3 ;Ha:μ=8.3(claim) C) H0:μ≥8.3(claim);Ha:μ<8.3 D) H0:μ ≤8.3 ;Ha:μ>8.3(claim) 2) Thestatementrepresentsaclaim.WriteitscomplementandstatewhichisH0andwhichisHA. p≤0.93 A) H0:p≤0.93(claim);Ha:p>0.93 B) H0:p>0.93;Ha:p≤0.93(claim) C) H0:p=0.93;Ha:p≠0.93(claim) D) H0:p≥0.93 (claim);Ha:p<0.93 3) Thestatementrepresentsaclaim.WriteitscomplementandstatewhichisH0andwhichisHA. σ<8.2 A) […]

Ch.8 HypothesisTestingwithTwoSamples 8.1 TestingtheDifferenceBetweenMeans(IndependentSamples,σ1andσ2Known) 1 DeterminetheDifferenceBetweenDependentandIndependentSamples MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Classifythetwogivensamplesasindependentordependent. Sample1:Pre–trainingweightsof18people Sample2:Post–trainingweightsof18people A) dependent B) independent 2) Classifythetwogivensamplesasindependentordependent. Sample1:Theweightsinpoundsof21newbornfemales Sample2:Theweightsinpoundsof21newbornmales A) independent B) dependent 3) Classifythetwogivensamplesasindependentordependent. Sample1:Thescoresof22studentswhotooktheACT Sample2:Thescoresof22differentstudentswhotooktheSAT A) independent B) dependent 4) Aspartofamarketingexperiment,adepartmentstoreregularlymaileddiscountcouponsto25ofitscredit cardholders.Theirtotalcreditcardpurchasesoverthenextthreemonthswerecomparedtotheirpriorcredit cardpurchasesduringthepreviousthreemonths.Determinewhetherthesamplesaredependentor independent. A) dependent B) […]

Ch.9 CorrelationandRegression 9.1 Correlation 1 InterpretScatterPlotsandCorrelations MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Giventhelengthofahumanʹsfemur,x,andthelengthofahumanʹshumerus,y,wouldyouexpectapositive correlation,anegativecorrelation,ornocorrelation? A) positivecorrelation B) negativecorrelation C) nocorrelation 2) Giventhesupplyofacommodity,x,andthepriceofacommodity,y,wouldyouexpectapositivecorrelation, anegativecorrelation,ornocorrelation? A) negativecorrelation B) positivecorrelation C) nocorrelation 3) Giventhesizeofahumanʹsbrain,x,andtheirscoreonanIQtest,y,wouldyouexpectapositivecorrelation,a negativecorrelation,ornocorrelation? A) nocorrelation B) positivecorrelation C) negativecorrelation 2 IdentifytheExplanatoryandResponseVariables SHORTANSWER.Writethewordorphrasethatbestcompleteseachstatementoranswersthequestion. Identifytheexplanatoryvariableandtheresponsevariable. 1) […]

Ch.10 Chi–SquareTestsandtheF–Distribution 10.1 Goodness–o f –FitTest 1 FindExpectedFrequencies SHORTANSWER.Writethewordorphrasethatbestcompleteseachstatementoranswersthequestion. Provideanappropriateresponse. 1) Thefrequencydistributionshowstheagesforasampleof100employees.Findtheexpectedfrequenciesfor eachclasstodetermineiftheemployeeagesarenormallydistributed. Classboundaries Frequency,f 29.5–39.5 14 39.5–49.5 29 49.5–59.5 31 59.5–69.5 18 69.5–79.5 8 2 PerformaChi–SquareGoodness–of–FitTest MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Manytrackrunnersbelievethattheyhaveabetterchanceofwinningiftheystartintheinsidelanethatis closesttothefield.Forthedatabelow,thelaneclosesttothefieldisLane1,thenextlaneisLane2,andsoon untiltheoutermostlane,Lane6.Thedataliststhenumberofwinsfortrackrunnersinthedifferentstarting positions.Calculatethechi–squareteststatisticχ2totesttheclaimthatthenumberofwinsisuniformly distributedacrossthedifferentstartingpositions.Theresultsarebasedon240wins. StartingPosition 123456 NumberofWins 45 36 […]

Ch.11 NonparametricTests 11.1 TheSignTest 1 PerformaSignTest MULTIPLECHOICE.Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. Provideanappropriateresponse. 1) Aconveniencestoreownerbelievesthatthemediannumberoflotteryticketssoldperdayis49.Arandom sampleof20daysyieldsthedatabelow.Findthecriticalvaluetotesttheownerʹsclaim. Useα=0.05. 32 48 59 64 31 55 70 27 33 38 47 54 54 44 44 49 49 59 54 38 A) 4 B) 2 C) 3 D) 5 […]