★★★businessstatistics(09b)op

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1、502CHAPTER9SimpleLinearRegression9.38TheU.S.DepartmentofAgriculturehasdevelopedretrievedusingMedlineasafunctionofthenumberxofandadoptedtheUniversalSoilLossEquationtermsinthesearchquery.basedonasampleofn=124(USLE)forpredictingwatererosionofsoils.Ingeo-queri

2、es.Theresultsarcsummarizedbelow:graphicalareaswhererunofffrommeltingsnowisjj=.202+.135xcommon,theUSLErequiresanaccurateestimateofsnowmeltrunofferosion.AnarticleintheJournaloft(fortestingH,:p,=0)=4.98SoilandWaterConservation(Mar.-Apr.1995)usedTwo-tailedp-va

3、lue=.001simplelinearregressiontodevelopasnowmeltero-a.Istheresufficientevidencetoindicatethatxandysionindex.Datafor54climatologicalstationsinarelinearlyrelated?Testusingcu=.01.CanadawereusedtomodeltheMcCoolwinter-adjust-b.Ifappropriate.usethemodeltopredict

4、thefractionedrainfallerosivityindex,y,asastraight-linefunctionofdocumentsretrievedforasearchquerywithx=3oftheonce-in-five-yearsnowmeltrunoffamount,xterms.(measuredinmillimeters).9.40Oneofthemostdifficulttasksofdevelopingandman-a.Thedatapointsareplottedinth

5、escattergramagingaglobalportfolioisassessingtherisksofpotentialshownbelow.Istherevisualevidenceofalinearforeigninvestments.DukeUniversityresearcherC.R.trend?HenrycollaboratedwithtwoFirstChicagoInvestmentb.ThedataforsevenstationswereremovedfromtheManagement

6、Companydirectorstoexaminetheuseofanalysisduetolackofsnowfallduringthestudype-countrycreditratingsasamcansofevaluatingforeignriod.Whyisthisstrategyadvisable?investments(JournalofPortfolioManagement,Wlnterc.Thesimplelinearregressionontheremaining1995).Tobeef

7、fective,suchameasureshouldhelpn=47datapointsyieldedthefollowingresults:explainandpredictthevolatilityoftheforeignmarketinquestion.Theresearchersanalyzeddataonannual-izedrisk(y)andaveragecreditrating(x)forthe40Usethisinformationtoconstructa90%confidencecoun

8、triesshowninthetableonp.504.AnSPSSprint-intervalforp,.outforasimplelinearregressionanalysisconductedond.Interprettheinterval,partc.thedataisalsoprovidedonp.503.9.39Oneofthemostcommontypesof"informationretriev