09-10秋季期中考卷

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1、Mid-SemesterExam1.Chebyshev’stheoremstatesthatthepercentageofmeasurementsinadatasetthatfallwithinthreestandarddeviationsoftheirmeanis:a.75%.b.atleast75%.c.89%.d.atleast89%.2.Whichofthefollowingisnotameasureofvariability?a.Therange.b.Thevariance.c.Thearithmeticmean.d.T

2、hestandarddeviation.e.Theinterquartilerange.3.Thelengthoftheboxinthebox-and-whiskerplotportraysthe:a.median.b.interquartilerange.c.range.d.thirdquartile.4.Asummarymeasurethatiscomputedfromasampletodescribeacharacteristicofthepopulationiscalled:a.aparameter.b.astatisti

3、c.c.apopulation.d.BothAandCarecorrect,sincetheyarethesame.5.Thefunctionf(x)thatdefinestheprobabilitydistributionofacontinuousrandomvariableXisa:a.binomialfunction.b.normalfunction.c.Poissonfunction.d.probabilitydensityfunction.6．Thenumberofaccidentsthatoccurannuallyon

4、abusystretchofhighwayisanexampleof:a.adiscreterandomvariable.b.acontinuousrandomvariable.c.adiscreteprobabilitydistribution.d.acontinuousprobabilitydistribution.7.Ifallpossiblesamplesofsizenaredrawnfromapopulation,theprobabilitydistributionofthesamplemeaniscalledthe:a

5、.standarderrorof.b.expectedvalueof.c.samplingdistributionof.d.normaldistribution.8.Ifarandomsampleofsizenisdrawnfromanormalpopulation,thenthesamplingdistributionofthesamplemeanwillbe:a.normalforallvaluesofn.b.normalonlyforn>30.c.approximatelynormalforallvaluesofn.d.ap

6、proximatelynormalonlyforn>30.9.Thestandarddeviationofthesamplingdistributionofthesamplemeanisalsocalledthe:a.centrallimittheorem.b.standarderrorofthemean.c.finitepopulationcorrectionfactor.d.populationstandarddeviation.10.Astatisticalmeasureofthestrengthofthelinearrel

7、ationshipbetweentworandomvariablesXandYisreferredtoasthe:a.expectedvalue.b.variance.c.covariance.d.standarddeviation.11.IfXandYarerandomvariableswithE(X)=5andE(Y)=8,thenE(2X+3Y)is:a.34.b.13.c.18.d.40.12.Whichofthefollowingisnotacharacteristicofabinomialexperiment?a.Th

8、ereisasequenceofidenticaltrials.b.Eachtrialresultsintwoormoreoutcomes.c.Thetrialsareindependentofeachother.d.Probabilityofsu