PAGE1PAGE12021统计学期末考试B（英文版）江西财经大学试卷参考答案Ⅰ、SINGLECHOICE(1′×5＝5′)1.C2.C3.C4.C5.DⅡ、JUDGE(Write“T”fortrueand“F”forfalse.1′×5＝5′)1.F2.F3.F4.F5.FⅢ、SIMPLEANSWER（5′×2=10′）1、Brieflydescribetherelationshipamongcoefficientofcorrelation、coefficientofregressionandcoefficientofdiscrimination,andexpressituseformula.ANSWER:Correlationcoefficient:Anumericalmeasureoflinearassociationbetweentwovariables.Ifthedatasetsarepopulations,thecoefficientis:Coefficientofregression:reflecttheaveragechangeofonevariablewhenavariablechangeaunit.CoefficientofDetermination:Ameasureofthegoodnessoftheestimatedregression.Itcanbeinterpretedastheproportionofthevariabilityinthedependentvariableythatisexplainedbytheestimatedregressionequation.r2=SSR/SSTRelationshipAmongr,b,andr22、BrieflydescribethecharacteristicsofLaspeyersindexandPaascheindex.ANSWER:LaspeyersindexAweightedaggregatepriceindexinwhichtheweightforeachitemisitsbase-periodquantity.PaascheindexAweightedaggregatepriceindexinwhichtheweightforeachitemisitscurrent-periodquantity.Ⅳ、CALCULATION（Total:60′）Arandomsampleofsize440acresisselectedfromavillage’srice,theresultoftestisthatthemeanproductionis450Kgandsamplestandarddeviationis80kg.Requirementsare:samplingstandarderrorofthemeanproduction:(9′)themeanproductionofwholevillage′sriceata95.45%probability.(8′)③sampleofsize:（8′）2、Thedataofcars′productionofanautomobilemanufacturerinrecentyearsaregivenasfollows:Year200020012002200320042005Quantity100020004000500070009000Pleaseworkouttheparametersaandbaccordingtothesedata,writeoutthetrendequationbyusingtheleastsquaresmethod,andexplaintheeconomicmeaningofb.（15′）ANSWER:Year123456Quantity100020004000500070009000Or:Year-5-3-1135Quantity100020004000500070009000Bisslopeofthetrendline.Reflecttheaveragechangeofonevariablewhentimevariablechangeaunit.(5′)3、Thedataofthequantityandpriceinamanufactureraregivenasfollows:products′NamequantitypriceQ0Q1P0P1Ⅰ（tai）Ⅱ（ton）Ⅲ（piece）20050015025055018050010002006001100210Pleasetrytoanalyzethechangeinthegrossvalueofoutputfromtwoaspects----relativenumberandabsolutenumberbyfactoranalysis.（20′）ANSWER:ProductsQ0Q1P0P1Q0P0Q1P1Q1P0I(tai)200250500600100000150000125000II(ton)50055010001100500000605000550000III(piece)150180200210300003780036000合计----630000792800711000ⅴ、CASEPROBLEM(20′)ANSWER:ⅰ.ⅱ.95%confidenceintervalestimateofthemeanageofunemployedindividualsinNewYork:ⅲ.ⅳ.Correlationcoefficient:
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