Chapter9CorrelationandRegressionAnalysisStatisticsinPracticeTherestaurantvocationinwesterncountrieshasanunwrittenlaw,thatiswhenconsumingserviceinrestaurant,peopleneedtopayaamountoftips,manypeopleheardofthathowmuchoftipsshouldpay?About16%ofbill,isittrue?Let’sseeingabouttable10-1,thedataintableisthesampledatathroughinvestigation,throughanalyzingandobservingthesedata,wecanfindoutthequantityrelationoftwo.Table10-1ThedataofbillandtipBill(dollar）33.550.787.998.863.6107.3120.7Tips(dollar）5.55.08.117.012.016.018.6STATChapter9CorrelationandRegressionAnalysisQuestionsare:1Arethereenoughevidencestoconclude:thereexistssomerelationsbetweenbillandtips?2Ifthisrelationexists,howtousethisrelationtoconfirmhowmuchofthetipsshouldbeleft?Thekeypointsinthischapteraremakingsomedeductionbasedonthesampledataappearedincouples.Exampleasabove,wewanttomakesureifthereexistssomerelationsbetweenbillandtips,ifitexists,wewanttouseaformulatodescribeit,bydoingsowecanfindouttherulespeopleobeyedwhentheypaytips.Therearemanyquestionslikethis,suchas:(1)Therateofcrimeandtherateofstealing;(2)Thecigarettesbeingconsumedandtherateofbeingcancered;(3)Thelevelofindividual’searningandtheyearsofbeingeducated;(4)Theageandbloodpressure;(5)Thestatureofparentsandchildren;(6)Thestipendandthepriceofalcohol;(7)Thelengthoflifelineinthepalmofpeopleandthelengthofpeople’slife-span.STATKeypoints1Correlativerelationsandthedescriptionofregressionequation;2Correlativerelationsofdetermination;3Fittheregressionequation;4Theapplicationofregressionequation.Difficultpoints1Calculatecoefficientofproduction-momentcorrelation2ThesumofsquaresoftotaldeviationanditsdecomposeReferencesandBibliography1、LiXinyu：《ApplicationEconomyStatistics》，BeijinguniversityPress；2、DavidS.Moore:《TheWorldofStatistics》，ZhongxinPress；3、YuanWei：《NewStatisticsTutorial》，EconomyandTechnologyPress；4、StatisticsWebsites：UNSD、OECD、ChinaNationalStatisticsBureau;Chapter9CorrelationandRegressionAnalysisSTATSummarizethecorrelationrelations1Mutualr...
