欢迎来到天天文库
浏览记录
ID:61667048
大小:351.00 KB
页数:21页
时间:2021-03-09
《商务与经济统计习题答案(第8版,中文版)SBE8-SM19.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、NonparametricMethodsChapter19NonparametricMethodsLearningObjectives1.Learnthedifferencebetweenparametricandnonparametricmethods.2.Knowtheparticularadvantagesofnonparametricmethodsandwhentheyareandwhentheyarenotapplicable.3.Learnhowtousethesigntestfortheanalysisofpairedcomparisons.4.
2、Beabletousethesigntesttoconducthypothesistestsaboutamedian.5.BeabletousetheWilcoxonsigned-ranktestandtheMann-Whitney-Wilcoxontesttodeterminewhetherornottwopopulationshavethesamedistribution.6.BeabletousetheKruskal-Wallistestsforthecomparisonofkpopulations.7.BeabletocomputetheSpearma
3、nrankcorrelationcoefficientandtestforasignificantcorrelationbetweentwosetsofrankings.19-21NonparametricMethodsSolutions:1.BinomialProbabilitiesforn=10,p=.50.xProbabilityxProbability0.00106.20511.00987.11722.04398.04393.11729.00984.205110.00105.2461P(0)+P(1)=.0108;addingP(2),exceeds.
4、025requiredinthetail.Therefore,rejectH0ifthenumberofplussignsislessthan2orgreaterthan8.Numberofplussignsis7.DonotrejectH0;concludethatthereisnoindicationthatadifferenceexists.2.Therearen=27casesinwhichavaluedifferentfrom150isobtained.Usethenormalapproximationwithµ=np=.5(27)=13.5andU
5、sex=22asthenumberofplussignsandobtainthefollowingteststatistic:Witha=.01,werejectifz>2.33;sincez=3.27>2.33werejectH0.Conclusion:themedianisgreaterthan150.3.a.Letp=probabilitythesharesheldwillbeworthmoreafterthesplitH0:p£.50Ha:p>.50IfH0cannotberejected,thereisnoevidencetoconcludestoc
6、ksplitscontinuetoaddvaluetostockholdings.b.Letxbethenumberofplussigns(increasesinvalue).Usethebinomialprobabilitytableswithn=18(therewere2tiesinthe20cases)P(x>12)=.0482RejectH0ifthenumberof+signsisgreaterthan12.c.Withx=14,werejectH0.Theresultssupporttheconclusionthatstocksplitsarebe
7、neficialforshareholders.19-21NonparametricMethods4.Weneedtodeterminethenumberwhosaidbetterandthenumberwhosaidworse.Thesumofthetwoisthesamplesizeusedforthestudy.n=.34(1253)+.29(1253)=789.4Usethelargesampletestusingthenormaldistribution.Thismeansthevalueofn(n=789.4above)neednotbeinteg
8、er.Hence,µ=.5n=.5(7
此文档下载收益归作者所有