商务统计学 2015期中考试卷.doc

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1、《商务统计》期中考试试题PartI:单选题(每题2分，共60分)1.Theuniverseor"totalityofitemsorthings"underconsiderationiscalleda)asample.b)apopulation.c)aparameter.d)astatistic.2.Whichofthefollowingismostlikelyapopulationasopposedtoasample?a)respondentstoanewspapersurvey.b)thefirst5studentscompletinganassignment.c)e

2、verythirdpersontoarriveatthebank.d)registeredvotersinacounty.3.AstudyisunderwayinYosemiteNationalForesttodeterminetheadultheightofAmericanpinetrees.Specifically,thestudyisattemptingtodeterminewhatfactorsaidatreeinreachingheightsgreaterthan60feettall.Itisestimatedthattheforestcontains25,0

3、00adultAmericanpines.Thestudyinvolvescollectingheightsfrom250randomlyselectedadultAmericanpinetreesandanalyzingtheresults.Identifythevariableofinterestinthestudy.a)TheageofanAmericanpinetreeinYosemiteNationalForest.b)TheheightofanAmericanpinetreeinYosemiteNationalForest.c)ThenumberofAmer

4、icanpinetreesinYosemiteNationalForest.d)ThespeciesoftreesinYosemiteNationalForest.4.TheBritishAirwaysInternetsiteprovidesaquestionnaireinstrumentthatcanbeansweredelectronically.Whichofthe4methodsofdatacollectionisinvolvedwhenpeoplecompletethequestionnaire?a)Publishedsourcesb)Experimentat

5、ionc)Surveyingd)Observation5.Tomonitorcampussecurity,thecampuspoliceofficeistakingasurveyofthenumberofstudentsinaparkingloteach30minutesofa24-hourperiodwiththegoalofdeterminingwhenpatrolsofthelotwouldservethemoststudents.IfXisthenumberofstudentsintheloteachperiodoftime,thenXisanexampleof

6、a)acategoricalrandomvariable.b)adiscreterandomvariable.c)acontinuousrandomvariable.d)astatistic.71.Aninsurancecompanyevaluatesmanynumericalvariablesaboutapersonbeforedecidingonanappropriaterateforautomobileinsurance.Arepresentativefromalocalinsuranceagencyselectedarandomsampleofinsureddr

7、iversandrecorded,X,thenumberofclaimseachmadeinthelast3years,withthefollowingresults.Xfrequency1142183124551Referringtothetable,howmanytotalclaimsarerepresentedinthesample?a)15b)50c)111d)250(ForQ7andQ8)Asurveywasconductedtodeterminehowpeopleratedthequalityofprogrammingavai