APStatisticsMultipleChoiceExam统计选择题文档格式.docx

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