APStatisticsMultipleChoiceExam统计选择题文档格式.docx
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Median:
45inches
StandardDeviation:
3inches
FirstQuartile:
43inches
ThirdQuartile:
48inches
About100childreninthesamplehaveheightsthatare
(A)lessthan43inches
(B)lessthan48inches
(C)between43and48inches
(D)between40and52inches
(E)morethan46inches
2.Inwhichofthefollowingsituationswoulditbemostdifficulttouseacensus?
(A)Todeterminewhatproportionoflicensedbicyclesonauniversitycampushavelights
(B)Todeterminewhatproportionofstudentsinahighschoolsupportwearinguniforms
(C)Todeterminewhatproportionofregisteredstudentsenrolledinacollegeareemployedmorethan
20hourseachweek
(D)Todeterminewhatproportionofsingle-familydwellingsinasmalltownhavetwo-cargarages
(E)TodeterminewhatproportionoffishinLakeMichiganarebass
3.Thedistributionofthediametersofaparticularvarietyoforangesisapproximatelynormalwithastandarddeviationof0.3inch.Howdoesthediameterofanorangeatthe67thpercentilecomparewiththemeandiameter?
(A)0.201inchbelowthemean
(B)0.132inchbelowthemean
(C)0.132inchabovethemean
(D)0.201inchabovethemean
(E)0.440inchabovethemean
4.Independentrandomsamplesof100luxurycarsand250non-luxurycarsinacertaincityareexaminedtoseeiftheyhavebumperstickers.Ofthe250non-luxurycars,125havebumperstickersandofthe100luxurycars,30havebumperstickers.Whichofthefollowingisa90percentconfidenceintervalforthedifferenceintheproportionofnon-luxurycarswithbumperstickersandtheproportionofluxurycarswithbumperstickersfromthepopulationofcarsrepresentedbythesesamples?
(A)
(B)
(C)
(D)
(E)
5.Asafetygroupclaimsthatthemeanspeedofdriversonahighwayexceedsthepostedspeedlimitof65milesperhour(mph).Toinvestigatethesafetygroup'
sclaim,whichofthefollowingstatementsisappropriate?
(A)Thenullhypothesisisthatthemeanspeedofdriversonthishighwayislessthan65mph.
(B)Thenullhypothesisisthatthemeanspeedofdriversonthishighwayisgreaterthan65mph.
(C)Thealternativehypothesisisthatthemeanspeedofdriversonthishighwayisgreaterthan65mph.
(D)Thealternativehypothesisisthatthemeanspeedofdriversonthishighwayislessthan65mph.
(E)Thealternativehypothesisisthatthemeanspeedofdriversonthishighwayisgreaterthanorequal
to65mph.
6.Afaircoinistobeflipped5times.Thefirst4flipsland"
heads"
up.Whatistheprobabilityof"
onthenext(5th)flipofthiscoin?
(B)
(E)
7.Thestemplotbelowshowstheyearlyearningspershareofstockfortwodifferentcompaniesoverasixteen-yearperiod.
CompanyACompanyB
058,75,96,98
92,91,90,82,78,43,38,26101,10,17,21,43,43,53,65,73
49,47,44,00209,27,29
73,27,05,023
Whichofthefollowingstatementsistrue?
(A)ThemedianoftheearningsofCompanyAislessthanthemedianoftheearningsoftheCompanyB.
(B)TherangeoftheearningsofCompanyAislessthantherangeoftheearningsofCompanyB.
(C)ThethirdquartileofCompanyAissmallerthanthethirdquartileofCompanyB.
(D)ThemeanoftheearningsofCompanyAisgreaterthanthemeanoftheearningsofCompanyB.
(E)TheinterquartilerangeofCompanyAistwicetheinterquartilerangeofCompanyB.
8.LetXrepresentarandomvariablewhosedistributionisnormal,withameanof100andastandarddeviationof10.WhichofthefollowingisequivalenttoP(X>
115)?
(A)P(X<
115)
(B)P(X≤115)
(C)P(X<
85)
(D)P(85<
X<
(E)1-P(X<
9.Atelevisionnewseditorwouldliketoknowhowlocalregisteredvoterswouldrespondtothequestion,"
Areyouinfavoroftheschoolbondmeasurethatwillbevotedoninanupcomingspecialelection?
"
Atelevisionsurveyisconductedduringabreakintheeveningnewsbylistingtwotelephonenumberssidebysideonthescreen,oneforviewerstocalliftheyapproveofthebondmeasure,andtheothertocalliftheydisapprove.Thissurveymethodcouldproducebiasedresultsforanumberofreasons.Whichoneofthefollowingisthemostobviousreason?
(A)Itusesastratifiedsampleratherthanasimplerandomsample.
(B)P