江西财经大学试卷C1(1).doc

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1、江西财经大年夜学试卷试卷代码：C课程学时：48课程名称：统计学有用东西：、SINGLECHOICE(155)1.Therearethreeblockproducts,thepercentofwastesjustas1.5%、2%、1%,therespectivequantitiesofwastesare25、30and45pieces.Thenwhatistheaveragerateofwaste.()ABCD2.Theretailsalesofacompanyhasincreased6%comparedwithlastyear,theaverageincreaseinpriceofeachp

2、roductis11%,thenhowmuchthequantitysoldincreasedordecreased()A.3B.4.5C.4.7D.17.73.Alltheotherconditionsholdconstant.Therelationthatbetweendesiredmarginoferror(E)andtheconfidenceindicates()is()A.thewiderrangeofdesiredmarginoferror,thelowerconfidenceindicatesB.thelowerprobability,thehighercredibilityC.

3、thehigherprobability,thehigherprecision,D.thelowerprobability,thelowercredibility4.Putthegoldreservesofourcountryintemporalorderbytheendofeachyearintherecent10years,theseriesis().A.dynamicseriesB.averageseriesC.timeseriesD.pointseries5.InaseriesofClassintervalclassification,iffrequencyoftheformergro

4、upofmodegroupisequaltothelaters,themodeis?()AtheinferiorlimitofthemodegroupBtheinferiorlimitofthemodegroupandonefourthofthewidthoftheclassesCtheinferiorlimitofthemodegroupandthreefourthsofthewidthoftheclassesDtheclassmid-valueofthemodegroupJUDGE(Write“Tfortrueand“Fforfalse.155)1.Thedistributionofpop

5、ulationbyageisaJshapeddistribution()2.Samplingwithreplacementandsamplingwithoutreplacementofthesizeofsamplesmaybedifferent,butthesamplingerroristhesame()3.Fromlinearfunctionyc=4502.5x，wecangetthattherelationshipbetweenvariesxandyispositive()4.In2005,thesameamountofRMBinacitycanonlybuy94%ofgoodscompa

6、redwith2004,thenthepriceincreasedby6%()5.Correlationanalysisisacausalrelationshipanalysis()、SIMPLEANSWER52=101.BrieflyanswertherelationsamongCorrelationcoefficientcoefficientofregressionanddiscriminatecoefficient,formulait2、Howtodescribethequantitativecharacteristicsofthepopulation?Pleasegivealistof

7、recapitulativeindicatorswhichcandescribethecharacteristicsofthepopulation.、CALCULATIONTotal:601.AMSG(味精)plantthatrequireseachbagofMSGweightnolessthan100gramsexamine1%ofitsproducts.Theresultisshownasfollows:(demandingtheresultsreservedtwodecimalplaces)(1)Developa95.45%confidenceintervalestimateofthem

8、eanweightoftheseMSGinthesamplingwithreplacementconditions:Anddeterminewhethertheweightfittothespecificationsweight.(10)(2)Trytoinfertherangeofrateofqualifiedproductsina95.45%levelofconfidenceintheconditionofsamplingwithreplacement.(8)(3)Inthesamecondition,howmanysamplesareneededifthelevelofconfidenc

9、eisincreasesto99.73%?(7)theweightofabag(gram)100andunder101-102102-104104-106106andovertotalquantitybag513621731002.In1982,thepopulationofChinais10.1billion,whichisamountto13billionin2004.WhatistheaverageincreaserateofChinaspopulationinthisperiod?Whatisthepopulationin2006accordingtothesamerate?(10)3

10、ThedataofthreeproductsproducedinHongXingMachineryPlantaregivenasfollows:ThenameofproductUnitcost(￥1000)quantity2004200520042005A(piece)56400500B(case)810500600C(kg)1215150200Requirementsare:1.Analyzethechangeofthegrosscostofthethreeproductsusingindexsystem.2.Known,HongXingMachineryPlanthasrealprofit

11、3600000Yuanin2005;trytocalculatetheprofitrateofcost,iftheplanedprofitrateofcostrequirestoberaisedto40%,howaboutthecompletionoftheprofitrateofcost?、CASEPROBLEM(20)Istheeducationalachievementlevelofstudentsrelatedtothespendingofperpupil?Inmanycommunitiesthisimportantquestionisbeingaskedbytaxpayerswhoa

12、rebeingaskedbytheirschooldistrictstoincreasetheamountoftaxrevenuespendoneducationTheproblemiswhetherincreasingspendoneducationwouldimprovethequalityofteachingandimprovestudentsachievement?ThedataaboutthespendingperpupilandstudentsComprehensiveachievementofthecountrys10regionscollectedbyFederalNation

13、alEducationAssessmentProjectisshownasfollows:stateSpendingperpupil(1000s)CompositescoresLuyiannuo4591Florida 3582Delaware5580New York6600Texas4550North Carolina4550Washington5611Rhode Island5610Minnesota4570George4540Questionsare:IDescribethepopulationscharacteristicsofthestudentsachievementindescri

14、ptivestatisticaldata.2.Useregressionanalysistoinvestigatetherelationshipbetweenthespendingperpupilandstudentscomprehensiveachievement.3.Doyouthinkthattheestimatedregressionequationdevelopedforthisdatacouldbeusedtoestimatethecompositescoresforthestatesthatdidnotparticipateinthetest?4.Basedonyouranalysis,doyouthinkthattheeducationalachievementlevelofstudentsisrelatedtohowmuchthestatespendsonperpupil?