2002 AP 统计真题

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1、2002AP真题STATISTICSSECTIONITime–90minutesNumberofquestions–40Percentoftotalgrade–50FORMADirections:Solveeachofthefollowingproblems,usingtheavailablespaceforscratchwork.Decidewhichisthebestofthechoicesgivenandfillinthecorrespondingovalontheanswersheet.Nocreditwillbegivenforanythingwritteninthe

2、testbook.Donotspendtoomuchtimeonanyoneproblem.1.Whichofthefollowingisakeydistinctionbetweenwelldesignedexperimentsandobservationalstudies?(A)Moresubjectsareavailableforexperimentsthanforobservationalstudies.(B)Ethicalconstraintspreventlarge-scaleobservationalstudies.(C)Experimentsarelesscost

3、lytoconductthanobservationalstudies.(D)Anexperimentcanshowadirectcause-and-effectrelationship,whereasanobservationalstudycannot.(E)Testsofsignificancecannotbeusedondatacollectedfromanobservationalstudy.2.Laurenisenrolledinaverylargecollegecalculusclass.Onthefirstexam,theclassmeanwas75andthes

4、tandarddeviationwas10.Onthesecondexam,theclassmeanwas70andthestandarddeviationwas15.Laurenscored85onbothexams.Assumingthescoresoneachexamwereapproximatelynormallydistributed,onwhichexamdidLaurenscorebetterrelativetotherestoftheclass?(A)Shescoredmuchbetteronthefirstexam.(B)Shescoredmuchbetter

5、onthesecondexam.(C)Shescoredaboutequallywellonbothexams.(D)Itisimpossibletotellbecausetheclasssizeisnotgiven.(E)Itisimpossibletotellbecausethecorrelationbetweenthetwosetsofexamscoresisnotgiven.12002AP真题3.Thenumberofsweatshirtsavendorsellsdailyhasthefollowingprobabilitydistribution.Numberof01

6、2345SweatshirtsxP(x)0.30.20.30.10.080.02Ifeachsweatshirtsellsfor$25,whatistheexpecteddailytotaldollaramounttakeninbythevendorfromthesaleofsweatshirts?(A)$5.00(B)$7.60(C)$35.50(D)$38.00(E)$75.004.Supposethatthedistributionofasetofscoreshasameanof47andastandarddeviationof14.If4isaddedtoeachsco

7、re,whatwillbethemeanandthestandarddeviationofthedistributionofnewscores?MeanStandardDeviation(A)5114(B)5118(C)4714(D)4716(E)47185.Avolunteerforamayoralcandidate’scampaignperiodicallyconductspollstoestimatetheproportionofpeopleinthecitywhoareplannin