最新statistics-2 by keller教学文案.doc

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1、__________________________________________________CHAPTER2GRAPHICALANDTABULARDESCRIPTIVETECHNIQUESSECTIONS1MULTIPLECHOICEQUESTIONSInthefollowingmultiple-choicequestions,pleasecirclethecorrectanswer.1.Whichofthefollowingstatementsisfalse?a.Allcalculationsarepermittedonintervaldatab.Allcalc

2、ulationsarepermittedonnominaldatac.Themostimportantaspectofordinaldataistheorderofthedatavaluesd.TheonlypermissiblecalculationsonordinaldataareonesinvolvingarankingprocessANSWER:b2.Theaveragenumberofunitsearnedpersemesterbycollegestudentsissuspectedtoberising.AresearcheratBostonCollegewis

3、hestoestimatethenumberofunitsearnedbystudentsduringthespringsemesterof2004atBoston.Todoso,herandomlyselects250studenttranscriptsandrecordsthenumberofunitseachstudentearnedinthespringtermof2004.Thevariableofinteresttotheresearcheristhea.numberofstudentsenrolledatBostonCollegeduringthesprin

4、gtermof2004b.averageindebtednessofBostonCollegestudentsenrolledinthespringc.ageofBostonCollegestudentsenrolledinthespringd.numberofunitsearnedbyBostonCollegestudentsduringthespringtermof2004ANSWER:d3.Theclassificationofstudentmajor(accounting,economics,management,marketing,other)isanexamp

5、leof收集于网络，如有侵权请联系管理员删除__________________________________________________a.acategoricalrandomvariable.b.adiscreterandomvariablec.acontinuousrandomvariabled.aparameter.ANSWER:a4.Astudyisunderwayinnationalforesttodeterminetheadultheightofpinetrees.Specifically,thestudyisattemptingtodetermine

6、whatfactorsaidatreeinreachingheightsgreaterthan50feettall.Itisestimatedthattheforestcontains32,000adultpines.Thestudyinvolvescollectingheightsfrom500randomlyselectedadultpinetreesandanalyzingtheresults.Thevariableofinterestinthestudyisthea.ageofapinetreeinthenationalforest.b.heightofapine

7、treeinthenationalforest.c.numberofpinetreesinthenationalforest.d.speciesoftreesinthenationalforest.ANSWER:b5.Theclassificationofstudentclassdesignation(freshman,sophomore,junior,senior)isanexampleofa.acategoricalrandomvariable.b.adiscreterandomvariable.c.acontinuous