统计学 英文.docx
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统计学 英文.docx
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统计学英文
BusinessStatisticsReviewSections
TrueorFalse
F1Acontinuousvariablemaytakeonanyvaluewithinitsrelevantrangeeventhoughthe
Measurementdevicemaynotbepreciseenoughtorecordit.
F2AMarinedrillinstructorrecordedthetimeinwhicheachof11recruitscompletedan
obstaclecoursebothbeforeandafterbasictraining.Totestwhetheranyimprovementoccurred,
theinstructorwoulduseat-distributionwith11degreesoffreedom.
T3Asamplingdistributionisadistributionforastatistic.
T4Atestforthedifferencebetweentwoproportionscanbeperformedusingthechi-square
distribution.
F5Asthesizeofthesampleisincreased,thestandarddeviationofthesamplingdistributionof
thesamplemeanforanormallydistributedpopulationwillstaythesame.
T6Determiningacollegestudent’sacademicmajorwouldbeanexampleofmeasurementona
nominalscaleofmeasurement.
T7Foragivenlevelofsignificance,ifthesamplesizeisincreased,thepowerofthetestwill
increase.
F8Foragivenlevelofsignificance,ifthesamplesizeisincreased,theprobabilityof
committingaTypeIerrorwillincrease.
T9Foralltwo-sampletests,thesamplesizesmustbeequalinthe2groups.
T10Histogramsareusedfornumericaldatawhilebarchartsaresuitableforcategoricaldata.
F11IfP(A)=0.4andP(B)=0.6,thenAandBmustbecollectivelyexhaustive.
T12Ifthepopulationdistributionissymmetric,thesamplingdistributionofthemeancanbe
approximatedbythenormaldistributionifthesamplescontain15observations.
F13Inachi-squaretest,itispossiblefortheobservedfrequenciestobefractionsordecimal
values.
T14Inaone-factorANOVAanalysis,theamongsumofsquaresandwithinsumofsquaresmust
adduptothetotalsumofsquares.
F15Informinga90%confidenceintervalforapopulationmeanfromasamplesizeof22,the
numberofdegreesoffreedomfromthetdistributionequals22.
F16Intestingthedifferencebetweentwoproportionsusingthenormaldistribution,wemayuse
eitheraone-tailedChi-squaretestortwo-tailedZtest.
17Ogivesareplottedatthemidpointsoftheclassgroupings.
T18Otherthingsbeingequal,astheconfidencelevelforaconfidenceintervalincreases,the
widthoftheintervalincreases.
T19Repeatedmeasurementsfromthesameindividualsisanexampleofdatacollectedfrom2
relatedpopulations.
F20Studentgrades(AtoF)areanexampleofcontinuousnumericaldata.
F21Theanalysisofvariance(ANOVA)testshypothesesaboutthepopulationvariance.
F22Theanswertothequestion“Whatisyourfavoritecolor?
”isanexampleofanordinalscaled
variable.
F23Thecoefficientofvariationmeasuresvariabilityinadatasetrelativetothesizeofthe
arithmeticmean.
F24TheFdistributionissymmetric.
T25Theinterquartilerangeisameasureofvariationordispersioninasetofdata.
F26Themedianofthevalues3.4,4.7,1.9,7.6,and6.5is1.9.
F27Themedianofthevalues3.4,4.7,1.9,7.6,and6.5is4.05.
F28Thenumberofcustomersarrivingatadepartmentstoreina5-minuteperiodhasabinomial
distribution.
F29Theprobabilitythatastandardnormalrandomvariable,Z,fallsbetween–2.00and–0.44is
0.6472.
T30Theprobabilitythatastandardnormalrandomvariable,Z,isbetween1.50and2.10isthe
sameastheprobabilityZisbetween–2.10and–1.50.
T31Thesmalleristhep-value,thestrongeristheevidenceagainstthenullhypothesis.
T32Thesumofcumulativefrequenciesinadistributionalwaysequals1.
F33Thesumofrelativefrequenciesinadistributionalwaysequals1.
F34WhenAandBaremutuallyexclusive,P(AorB)canbefoundbyaddingP(A)andP(B).
T35WhentheFtestisusedforANOVA,therejectionregionisalwaysintherighttail.
T36Aresearcheriscuriousabouttheeffectofsleeponstudents’testperformances.Hechooses
60studentsandgiveseach2tests:
onegivenafter2hours’sleepandoneafter8hours’sleep.The
testtheresearchershouldusewouldbearelatedsamplestest.
T37Asampleistheportionoftheuniversethatisselectedforanalysis.
F38InaPoissondistribution,themeanandvarianceareequal.
T39Thelargeristhep-value,themorelikelyoneistorejectthenullhypothesis.
T40Thenumberofcustomersarrivingatadepartmentstoreina5-minuteperiodhasaPoisson
distribution.
Choice
ATheprocessofusingsamplestatisticstodrawconclusionsabouttruepopulationparametersis
called
(A)statisticalinference.(B)thescientificmethod.
(C)sampling.(D)descriptivestatistics.
DThosemethodsinvolvingthecollection,presentation,andcharacterizationofasetofdatainordertoproperlydescribethevariousfeaturesofthatsetofdataarecalled
(A)statisticalinference.(B)thescientificmethod.
(C)sampling.(D)descriptivestatistics.
CThecollectionandsummarizationofthesocioeconomicandphysicalcharacteristicsofthe
employeesofaparticularfirmisanexampleof
(A)inferentialstatistics.(B)descriptivestatistics.
(C)aparameter.(D)astatistic.
DTheestimationofthepopulationaveragefamilyexpenditureonfoodbasedonthesampleaverageexpenditureof1,000familiesisanexampleof
(A)inferentialstatistics.(B)descriptivestatistics.
(C)aparameter.(D)astatistic.
BTheuniverseor"totalityofitemsorthings"underconsiderationiscalled
(A)asample.(B)apopulation.
(C)aparameter.(D)astatistic.
ATheportionoftheuniversethathasbeenselectedforanalysisiscalled
(A)asample.(B)aframe.(C)aparameter.(D)astatistic.
BAsummarymeasurethatiscomputedtodescribeacharacteristicofanentirepopulationiscalled
(A)acensus.(B)aparameter.(C)astatistic.(D)thescientificmethod.
CAsummarymeasurethatiscomputedtodescribeacharacteristicfromonlyasampleofthe
populationiscalled
(A)aparameter.(B)acensus.(C)astatistic.(D)thescientific
method.
DWhichofthefollowingismostlikelyapopulationasopposedtoasample?
(A)respondentstoanewspapersurvey.(B)thefirst5studentscompletinganassignment.
(C)everythirdpersontoarriveatthebank.(D)registeredvotersinacounty.
AWhenstudyingthesimultaneousresponsestotwocategoricalquestions,weshouldsetupa
(A)contingencytable.(B)frequencydistributiontable.
(C)cumulativepercentagedistributiontable.(D)histogram.
Bwhichofthefollowingismostlikelyaparameterasopposedtoastatistic?
(A)Theaveragescoreofthefirstfivestudentscompletinganassignment.
(B)Theproportionoffemalesregisteredtovoteinacounty.
(C)Theaverageheightofpeoplerandomlyselectedfromadatabase.
(D)Theproportionoftrucksstoppedyesterdaythatwerecitedforbadbrakes.
BWhenpolygonsorhistogramsareconstructed,whichaxismustshowthetruezeroor"origin"?
(A)Thehorizontalaxis.(B)Theverticalaxis.
(C)Boththehorizontalandverticalaxes.(D)Neitherthehorizontalnortheverticalaxis.
AAsurveyof150executiveswereaskedwhattheythinkisthemostcommonmistakecandidates
makeduringjobinterviews.Sixdifferentmistakesweregiven.Whichofthefollowingisthe
bestforpresentingtheinformation?
(A)Abarchart.(B)Ahistogram
(C)Astem-and-leafdisplay.(D)Acontingencytable.
DWhichofthefollowingstatisticsisnotameasureofcentraltendency?
(A)Arithmeticmean.(B)Median.(C)Mode.(D)Q3.
AYouhavecollectedinformationonthemarketshareof5differentsearchenginesusedbyU.S.
InternetusersinMay2007.Whichofthefollowingisthebestforpresentingtheinformation?
(A)Apiechart.(B)Ahistogram
(C)Astem-and-leafdisplay.(D)Acontingencytable.
Whichmeasureofcentraltendencycanbeusedforbothnumericalandcategoricalvariables?
(A)Arithmeticmean.(B)Median.(C)Mode.(D)Standarddeviation.
DInaright-skeweddistribution
(A)themedianequalsthearithmeticmean(B)themedianislessthanthearithmeticmean.
(C)themedianislargerthanthearithmeticmean.(D)noneoftheabove.
CIftwoeventsarecollectivelyexhaustive,whatistheprobabilitythatbothoccuratthesametime?
(A)0.(B)0.50.
(C)1.00.(D)Cannotbedeterminedfromtheinformationgiven.
CInaperfectlysymmetricaldistribution
(A)therangeequalstheinterquartilerange.
(B)theinterquartilerangeequalsthearithmeticmean.
(C)themedianequalsthearithmeticmean.
(D)thevarianceequalsthestandarddeviation.
DIftwoeventsaremutuallyexclusive,whatistheprobabilitythatoneortheotheroccurs?
(A)0.(B)0.50.(C)1.00.(D)Cannotbedeterminedfromthe
informationgiven.
ASimpleprobabilityisalsocalled
(A)marginalprobability.(B)jointprobability.
(C)conditionalprobability.(D)Bayes'theorem.
BIftheoutcomeofeventAisnotaffectedbyeventB,theneventsAandBaresaidtobe
(A)mutuallyexclusive.(B)statisticallyindependent.
(C)collectivelyexhaustive.(D)Noneoftheabove.
BWhichofthefollowingaboutthebinomialdistributionisnotatruestatement?
(A)Theprobabilityofeventofinterestmustbeconstantfromtrialtotrial.
(B)Eachoutcomeisindependentoftheother.
(C)Eachoutcomemaybeclassifiedaseither"eventofinterest"or"noteventofinterest."
(D)Therandomvariableofinterestiscontinuous.
CWhichofthefollowingaboutthenormaldistributionisnottrue?
(A)Theoretically,themean,median,andmodearethesame.
(B)About2/3oftheobservationsfallwithin1standarddeviationfromthemean.
(C)Itisadiscreteprobabilitydistribution.
(D)Itsparametersarethemean,,andstandarddeviation,.
CIfn=10andp=0.70,thenthemeanofthebinomialdistributionis
(A)0.07(B
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