江西财经大学试卷C1(1).doc

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(1×55)1.Therearethreeblockproducts,thepercentofwastesjustas1.5%、2%、1%,therespectivequantitiesofwastesare25、30and45pieces.Thenwhatistheaveragerateofwaste.()ABCD2.Theretailsalesofacompanyhasincreased6%comparedwithlastyear,theaverageincreaseinpriceofeachproductis11%,thenhowmuchthequantitysoldincreasedordecreased()A.3B.4.5C.4.7D.17.73.Alltheotherconditionsholdconstant.Therelationthatbetweendesiredmarginoferror(E)andtheconfidenceindicates()is()A.thewiderrangeofdesiredmarginoferror,thelowerconfidenceindicatesB.thelowerprobability,thehighercredibilityC.thehigherprobability,thehigherprecision,D.thelowerprobability,thelowercredibility4.Putthegoldreservesofourcountryintemporalorderbytheendofeachyearintherecent10years,theseriesis().A.dynamicseriesB.averageseriesC.timeseriesD.pointseries5.InaseriesofClassintervalclassification,iffrequencyoftheformergroupofmodegroupisequaltothelaters,themodeis?()AtheinferiorlimitofthemodegroupBtheinferiorlimitofthemodegroupandonefourthofthewidthoftheclassesCtheinferiorlimitofthemodegroupandthreefourthsofthewidthoftheclassesDtheclassmid-valueofthemodegroupJUDGE(Write“Tfortrueand“Fforfalse.1×55)1.ThedistributionofpopulationbyageisaJshapeddistribution()2.Samplingwithreplacementandsamplingwithoutreplacementofthesizeofsamplesmaybedifferent,butthesamplingerroristhesame()3.Fromlinearfunctionyc=4502.5x，wecangetthattherelationshipbetweenvariesxandyispositive()4.In2005,thesameamountofRMBinacitycanonlybuy94%ofgoodscomparedwith2004,thenthepriceincreasedby6%()5.Correlationanalysisisacausalrelationshipanalysis()、SIMPLEANSWER5×2=101.BrieflyanswertherelationsamongCorrelationcoefficientcoefficientofregressionanddiscriminatecoefficient,formulait2、Howtodescribethequantitativecharacteristicsofthepopulation?Pleasegivealistofrecapitulativeindicatorswhichcandescribethecharacteristicsofthepopulation.、CALCULATIONTotal:601.AMSG(味精)plantthatrequireseachbagofMSGweightnolessthan100gramsexamine1%ofitsproducts.Theresultisshownasfollows:(demandingtheresultsreservedtwodecimalplaces)(1)Developa95.45%confidenceintervalestimateofthemeanweightoftheseMSGinthesamplingwithreplacementconditions:Anddeterminewhethertheweightfittothespecificationsweight.(10)(2)Trytoinfertherangeofrateofqualifiedproductsina95.45%levelofconfidenceintheconditionofsamplingwithreplacement.(8)(3)Inthesamecondition,howmanysamplesareneededifthelevelofconfidenceisincreasesto99.73%?(7)theweightofabag(gram)100andunder101-102102-104104-106106andovertotalquantitybag513621731002.In1982,thepopulationofChinais10.1billion,whichisamountto13billionin2004.WhatistheaverageincreaserateofChina'spopulationinthisperiod?Whatisthepopulationin2006accordingtothesamerate?(10)3ThedataofthreeproductsproducedinHongXingMachineryPlantaregivenasfollows:ThenameofproductUnitcost(￥1000)quantity2004200520042005A(piece)56400500B(case)810500600C(kg)1215150200Requirementsare:1.Analyzethechangeofthegrosscostofthethreeproductsusingindexsystem.2.Known,HongXingMachineryPlanthasrealprofit3600000Yuanin2005;trytocalculatetheprofitrateofcost,iftheplanedprofitrateofcostrequirestoberaisedto40%,howaboutthecompletionoftheprofitrateofcost?、CASEPROBLEM(20)Istheeducationalachievementlevelofstudentsrelatedtothespendingofperpupil?InmanycommunitiesthisimportantquestionisbeingaskedbytaxpayerswhoarebeingaskedbytheirschooldistrictstoincreasetheamountoftaxrevenuespendoneducationTheproblemiswhetherincreasingspendoneducationwouldimprovethequalityofteachingandimprovestudentsachievement?ThedataaboutthespendingperpupilandstudentsComprehensiveachievementofthecountrys10regionscollectedbyFederalNationalEducationAssessmentProjectisshownasfollows:stateSpendingperpupil(1000s)CompositescoresLuyiannuo4591Florida 3582Delaware5580New York6600Texas4550North Carolina4550Washington5611Rhode Island5610Minnesota4570George4540Questionsare:IDescribethepopulationscharacteristicsofthestudentsachievementindescriptivestatisticaldata.2.Useregressionanalysistoinvestigatetherelationshipbetweenthespendingperpupilandstudentscomprehensiveachievement.3.Doyouthinkthattheestimatedregressionequationdevelopedforthisdatacouldbeusedtoestimatethecompositescoresforthestatesthatdidnotparticipateinthetest?4.Basedonyouranalysis,doyouthinkthattheeducationalachievementlevelofstudentsisrelatedtohowmuchthestatespendsonperpupil?