江西财经大学试卷参考答案(1).doc

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1、试卷参考答案及评分标准试卷代码：06003B课程学时：48课程名称：统计学有用东西：、SINGLECHOICE(155)1.C2.C3.C4.C5.D、JUDGE(Write“Tfortrueand“Fforfalse.155)1.F2.F3.F4.F5.F、SIMPLEANSWER52=101、Brieflydescribetherelationshipamongcoefficientofcorrelation、coefficientofregressionandcoefficientofdiscrimination,andexpressituseformula.ANSWER:Correla

2、tioncoefficient:Anumericalmeasureoflinearassociationbetweentwovariables.Ifthedatasetsarepopulations,thecoefficientis:Coefficientofregression:reflecttheaveragechangeofonevariablewhenavariablechangeaunit.CoefficientofDetermination:Ameasureofthegoodnessoftheestimatedregression.Itcanbeinterpretedasthepr

3、oportionofthevariabilityinthedependentvariableythatisexplainedbytheestimatedregressionequation.r2=SSR/SSTRelationshipAmongr,b,andr22、BrieflydescribethecharacteristicsofLaspeyersindexandPaascheindex.ANSWER:LaspeyersindexAweightedaggregatepriceindexinwhichtheweightforeachitemisitsbase-periodquantity.P

4、aascheindexAweightedaggregatepriceindexinwhichtheweightforeachitemisitscurrent-periodquantity.、CALCULATIONTotal:60Arandomsampleofsize440acresisselectedfromavillagesrice,theresultoftestisthatthemeanproductionis450Kgandsamplestandarddeviationis80kg.Requirementsare: samplingstandarderrorofthemeanproduc

5、tion:(9) themeanproductionofwholevillagesriceata95.45%probability.(8)sampleofsize:82、Thedataofcarsproductionofanautomobilemanufacturerinrecentyearsaregivenasfollows:Year200020012002200320042005Quantity100020004000500070009000Pleaseworkouttheparametersaandbaccordingtothesedata,writeoutthetrendequatio

6、nbyusingtheleastsquaresmethod,andexplaintheeconomicmeaningofb.15ANSWER:Year123456Quantity100020004000500070009000Or:Year-5-3-1135Quantity100020004000500070009000Bisslopeofthetrendline.Reflecttheaveragechangeofonevariablewhentimevariablechangeaunit.(5)3、Thedataofthequantityandpriceinamanufacturerareg

7、ivenasfollows:productsNamequantitypriceQ0Q1P0P1taitonpiece20050015025055018050010002006001100210Pleasetrytoanalyzethechangeinthegrossvalueofoutputfromtwoaspects-relativenumberandabsolutenumberbyfactoranalysis.20ANSWER:ProductsQ0Q1P0P1Q0P0Q1P1Q1P0I(tai)200250500600100000150000125000II(ton)50055010001100500000605000550000III(piece)150180200210300003780036000合计-630000792800711000、CASEPROBLEM(20)ANSWER:.95%confidenceintervalestimateofthemeanageofunemployedindividualsinNew York:.Correlationcoefficient: