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首页 IGCSE-Statistics 统计学03900390_s05_er

IGCSE-Statistics 统计学03900390_s05_er.pdf

IGCSE-Statistics 统计学03900390_s0…

jennifer__jie
2012-03-04 0人阅读 举报 0 0 暂无简介

简介:本文档为《IGCSE-Statistics 统计学03900390_s05_erpdf》,可适用于高等教育领域

Mathematics:Statistics(HalfCredit)JuneCONTENTSFOREWORDMATHEMATICS:STATISTICS(HALFCREDIT)PaperPaperFOREWORDThisbookletcontainsreportswrittenbyExaminersontheworkofcandidatesincertainpapersItscontentsareprimarilyfortheinformationofthesubjectteachersconcernedwwwxtremepapersnetMathematics:Statistics(HalfCredit)JuneMATHEMATICS:STATISTICS(HALFCREDIT)PaperPaperGeneralcommentsThispaperproducedawiderangeofmarksWhilstmostcandidateswereabletoattemptallthequestions,thereweresomeCentreswhoenteredcandidateswhohadclearlynotcoveredthesyllabusandwhofailedtoreachtherequiredstandardMostcandidatesansweredquestionstoasuitabledegreeofaccuracy,anditwaspleasingtoobservethatonlyafewlostmarksduetoprematureapproximationThisoccurredmainlyintheuseofnormaltablesCandidatesseemedtohavesufficienttimetoanswerallthequestions,andonlytheweakeronesansweredquestionsoutoforderCommentsonspecificquestionsQuestionThiswaswellattemptedbymostofthecandidateswhohadcoveredthesyllabusNearlyeveryonerecognisedthenormalapproximationtothebinomialandapleasingnumberappliedthecontinuitycorrectionwithalmostallwhodidsogettingitinthecorrectdirectionAsinpreviousyears,manylostmarksbyfindingthewrongareaAnswer:QuestionThisstraightforwardquestiononthemeanandstandarddeviationofgroupedfrequenciesproducedmanycorrectanswersbutsomecandidatesprovidedanswerswhichdidnotusethemidpointofthefrequenciesTheupperend,thelowerend,theclasswidth,andthesemiclasswidthwereallusedThemarkschemeawardedmethodmarksfortryingsomething,somostcandidateswereabletoscoreafewmarkshereInpart(ii)thecorrectmidpointshadtobeusedtogainthemethodmarkAsizeablenumberofcandidatesworkedbackwardsfromtheanswertoshowthatfhadtobeandthenproceededtoverifyitThisscoredatmostmarksoutoftheAnswer:(ii)QuestionMostcandidatesmanagedtoobtainedthegivenanswerforpart(i)butmanyfailedtoseeanyconnectionbetweenthispartandthenextpart,whichwasaboutcompletingtheprobabilitydistributiontableThedecimalplacerequirementwasnotobservedbyeveryone,somegivingtheanswerasafractionortosignificantfigures,resultinginthelossofamarkHowever,amarkwasgivenforappreciatingthevaluesofXcouldbeanythingfromtoinclusiveandmanyweakercandidatesmanagedtopickupamarkhereAnswer:(ii),,,,,,wwwxtremepapersnetMathematics:Statistics(HalfCredit)JuneQuestionTherearemanyusefulfeaturesofaboxandwhiskerplot,andcommentssuchas‘showsthedistribution’,‘noneofthedataarelost’,‘easytofindthemode’wereallacceptableCommentssuchas‘quickandeasytounderstand’werenotdeemedsufficientTherewasgenerallygoodworkatfindingthemediansandquartilesAfewfailedtoputinthedecimalpoint,thuslosingamarkThegraphwaswelldonewithmostcandidatesknowingwhataboxandwhiskerplotwasThemarkgivenforseeingtheword‘cholesterol’somewhereonthegraphwasgenerallynotobtainedVeryfewcandidatesgaveaheading,orsaidthattheaxisrepresentedcholesterolcountAnswer:(ii),,QuestionThisquestionproducedthegreatestvarietyofanswersCandidatesfailedtoappreciatethattheresultscouldbereadoffthetablestraightaway,andusedcomplicatedtreediagramapproachesThesedidcomeupwiththecorrectanswereventuallyifnomistakesweremadePart(iii)onindependenteventswaspoorlyattempted,withmanycandidatesusingcolloquialEnglishratherthanmathematicstoarguetheirpoint,andothersbecomingmuddledwithindependenteventsEquivalentformsofthefractionswereacceptedAnswers:(i)(ii)(iv)QuestionThereweresomecasesofprematureapproximationhere,withcandidatesfailingtousethenormaltablesproperly,butgenerallypart(i)waswelldoneManycandidatesjustignoredfindingtheprobabilitythatalltyreshadtherequiredpressures,andjustfoundtheprobabilityforonetyreVeryfewgotanywherewithpart(ii)Probablyaboutfoundthezvaluetobe,andanotherfound,whichthoughincorrect,allowedthemtoscoremarksoutofiftheiranswerwascorrectlyworkedoutTherestscorednothingAnswers:(i)(ii)toQuestionThis,thelastquestiononthepaper,waswellattemptedbymanycandidates,withalmosteveryonescoringwellonpart(ii)andasignificantnumberdoingwellonbothpartsAnswers:(i)(ii)(iii)(iv)wwwxtremepapersnet

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