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statistics2bykeller

CHAPTER2

GRAPHICALANDTABULAR

DESCRIPTIVETECHNIQUES

SECTIONS1

MULTIPLECHOICEQUESTIONS

Inthefollowingmultiple-choicequestions,pleasecirclethecorrectanswer.

1.Whichofthefollowingstatementsisfalse?

a.Allcalculationsarepermittedonintervaldata

b.Allcalculationsarepermittedonnominaldata

c.Themostimportantaspectofordinaldataistheorderofthedatavalues

d.Theonlypermissiblecalculationsonordinaldataareonesinvolvingarankingprocess

ANSWER:

b

2.Theaveragenumberofunitsearnedpersemesterbycollegestudentsissuspectedtoberising.AresearcheratBostonCollegewishestoestimatethenumberofunitsearnedbystudentsduringthespringsemesterof2004atBoston.Todoso,herandomlyselects250studenttranscriptsandrecordsthenumberofunitseachstudentearnedinthespringtermof2004.Thevariableofinteresttotheresearcheristhe

a.numberofstudentsenrolledatBostonCollegeduringthespringtermof2004

b.averageindebtednessofBostonCollegestudentsenrolledinthespring

c.ageofBostonCollegestudentsenrolledinthespring

d.numberofunitsearnedbyBostonCollegestudentsduringthespringtermof2004

ANSWER:

d

3.Theclassificationofstudentmajor（accounting,economics,management,marketing,other）isanexampleof

a.acategoricalrandomvariable.

b.adiscreterandomvariable

c.acontinuousrandomvariable

d.aparameter.

ANSWER:

a

4.Astudyisunderwayinnationalforesttodeterminetheadultheightofpinetrees.Specifically,thestudyisattemptingtodeterminewhatfactorsaidatreeinreachingheightsgreaterthan50feettall.Itisestimatedthattheforestcontains32,000adultpines.Thestudyinvolvescollectingheightsfrom500randomlyselectedadultpinetreesandanalyzingtheresults.Thevariableofinterestinthestudyisthe

a.ageofapinetreeinthenationalforest.

b.heightofapinetreeinthenationalforest.

c.numberofpinetreesinthenationalforest.

d.speciesoftreesinthenationalforest.

ANSWER:

b

5.Theclassificationofstudentclassdesignation（freshman,sophomore,junior,senior）isanexampleof

a.acategoricalrandomvariable.

b.adiscreterandomvariable.

c.acontinuousrandomvariable.

d.aparameter.

ANSWER:

a

6.Mostanalystsfocusonthecostoftuitionasthewaytomeasurethecostofacollegeeducation.Butincidentals,suchastextbookcosts,arerarelyconsidered.AresearcheratFerrisStateUniversitywishestoestimatethetextbookcostsoffirst-yearstudentsatFerris.Todoso,hemonitoredthetextbookcostof200first-yearstudentsandfoundthattheiraveragetextbookcostwas$275persemester.Thevariableofinteresttotheresearcheristhe

a.textbookcostoffirst-yearFerrisStateUniversitystudents.

b.yearinschoolofFerrisStateUniversitystudents.

c.ageofFerrisStateUniversitystudents.

d.costofincidentalexpensesofFerrisStateUniversitystudents.

ANSWER:

a

7.Themanagerofthecustomerservicedivisionofamajorconsumerelectronicscompanyisinterestedindeterminingwhetherthecustomerswhohavepurchasedavideocassetterecordermadebythecompanyoverthepast12monthsaresatisfiedwiththeirproducts.Thepossibleresponsestothequestion“Areyouhappy,indifferent,orunhappywiththeperformanceperdollarspentonthevideocassetterecorder?

”arevaluesfroma

a.discretenumericalrandomvariable.

b.continuousnumericalrandomvariable

c.categoricalrandomvariable.

d.parameter.

ANSWER:

c

TRUE/FALSEQUESTIONS

8.Thereareactuallyfourtypesofdata:

nominal,ordinal,interval,andratio.However,forstatisticalpurposes,thereisnodifferencebetweenintervalandratiodata,andtheauthorsofyourbookcombinethetwotypes.

ANSWER:

T

9.Quantitativevariablesusuallyrepresentmembershipingroupsorcategories.

ANSWER:

F

10.Intervaldata,suchasheights,weights,andincomes,arealsoreferredtoasquantitativeornumericaldata.

ANSWER:

T

11.Nominaldataarealsocalledqualitativeorcategoricaldata.

ANSWER:

T

12.ATPsinglesrankingsfortennisplayersisanexampleofanintervalscale.

ANSWER:

F

13.Intervaldatamaybetreatedasordinalornominal.

ANSWER:

T

14.Nominaldatamaybetreatedasordinalorinterval

ANSWER:

F

15.ProfessorHogggraduatedfromtheUniversityofIowawithacodevalue=2whileProfessorMaasgraduatedfromMichiganStateUniversitywithacodevalue=1.Thescaleofmeasurementlikelyrepresentedbythisinformationisinterval.

ANSWER:

F

16.Ordinaldatamaybetreatedasintervalbutnotasnominal.

ANSWER:

F

17.Avariableissomecharacteristicofapopulation,whiledataaretheobservedvaluesofavariablebasedonasample.

ANSWER:

F

18.Anautomobileinsuranceagentbelievesthatcompany“A”ismorereliablethancompany“B”.Thescaleof