MultipleChoice Afrequencydistributionisatabularsummaryofdatashowingthe fractionofitemsinseveralclasses percentageofitemsinseveralclasses relativepercentageofitemsinseveralclasses numberofitemsinseveralclasses ANSWER: d AnOgiveisconstructedbyplottingapointcorrespondingtothe frequencyofeachclass. relative cumulative percent octave ANSWER: b Atabularsummaryofasetofdatashowingthefractionofthetotalnumberofitemsinseveralclassesisa frequencydistribution relativefrequencydistribution frequency cumulativefrequencydistribution ANSWER: b Therelativefrequencyofaclassiscomputedby dividingthemidpointoftheclassbythesamplesize dividingthefrequencyoftheclassbythemidpoint dividingthesamplesizebythefrequencyoftheclass dividingthefrequencyoftheclassbythesamplesize ANSWER: d Thepercentfrequencyofaclassiscomputedby multiplyingtherelativefrequencyby10 dividingtherelativefrequencyby100 multiplyingtherelativefrequencyby100 adding100totherelativefrequency ANSWER: c Thesumoffrequenciesforallclasseswillalwaysequal
1 thenumberofelementsinadataset thenumberofclasses avaluebetween0and1 ANSWER: b alinechart onlyabarchart onlyapiechart bothabarchartandapiechart ANSWER: d Aresearcherisgatheringdatafromfourgeographicalareasdesignated:South=1;North=2;East=3;West=4. Thedesignatedgeographicalregionsrepresent categoricaldata quantitativedata labeldata eitherquantitativeorcategoricaldata ANSWER: a Categoricaldatacanbegraphicallyrepresentedbyusinga(n) histogram frequencypolygon ogive barchart ANSWER: d Acumulativerelativefrequencydistributionshows theproportionofdataitemswithvalueslessthanorequaltotheupperlimitofeachclass theproportionofdataitemswithvalueslessthanorequaltothelowerlimitofeachclass thepercentageofdataitemswithvalueslessthanorequaltotheupperlimitofeachclass thepercentageofdataitemswithvalueslessthanorequaltothelowerlimitofeachclass ANSWER: a fewestclasses mostclasses samenumberofclassesastheotherdistributionssinceallareconstructedfromthesamedata
ANSWER: a Thesumoftherelativefrequenciesforallclasseswillalwaysequal thesamplesize thenumberofclasses one anyvaluelargerthanone ANSWER: c Thesumofthepercentfrequenciesforallclasseswillalwaysequal one thenumberofclasses ANSWER: d Themostcommongraphicalpresentationofquantitativedataisa histogram barchart relativefrequency piechart ANSWER: a Thetotalnumberofdataitemswithavaluelessthantheupperlimitfortheclassisgivenbythe frequencydistribution relativefrequencydistribution cumulativefrequencydistribution cumulativerelativefrequencydistribution ANSWER: c Therelativefrequencyofaclassiscomputedby dividingthecumulativefrequencyoftheclassbyn dividingnbycumulativefrequencyoftheclass dividingthefrequencyoftheclassbyn dividingthefrequencyoftheclassbythenumberofclasses ANSWER: c Inconstructingafrequencydistribution,theapproximateclasswidthiscomputedas (largestdatavalue-smallestdatavalue)/numberofclasses (largestdatavalue-smallestdatavalue)/samplesize (smallestdatavalue-largestdatavalue)/samplesize largestdatavalue/numberofclasses
ANSWER: a Inconstructingafrequencydistribution,asthenumberofclassesaredecreased,theclasswidth decreases remainsunchanged increases canincreaseordecreasedependingonthedatavalues ANSWER: c Thedifferencebetweenthelowerclasslimitsofadjacentclassesprovidesthe numberofclasses classlimits classmidpoint classwidth ANSWER: d Inacumulativefrequencydistribution,thelastclasswillalwayshaveacumulativefrequencyequalto thetotalnumberofelementsinthedataset Noneofthesealternativesiscorrect. ANSWER: c Inacumulativerelativefrequencydistribution,thelastclasswillhaveacumulativerelativefrequencyequalto one zero thetotalnumberofelementsinthedataset Noneofthesealternativesiscorrect. ANSWER: a Inacumulativepercentfrequencydistribution,thelastclasswillhaveacumulativepercentfrequencyequalto thetotalnumberofelementsinthedataset Noneofthesealternativesiscorrect. ANSWER: b Datathatprovidelabelsornamesforcategoriesoflikeitemsareknownas categoricaldata quantitativedata 0 100%
labeldata categorydata ANSWER: a Atabularmethodthatcanbeusedtosummarizethedataontwovariablessimultaneouslyiscalled simultaneousequations crosstabulation ahistogram anogive ANSWER: b Agraphicalpresentationoftherelationshipbetweentwovariablesis anogive ahistogram eitheranogiveorahistogram,dependingonthetypeofdata ascatterdiagram ANSWER: d Ahistogramissaidtobeskewedtotheleftifithasa longertailtotheright shortertailtotheright shortertailtotheleft longertailtotheleft ANSWER: d Whenahistogramhasalongertailtotheright,itissaidtobe symmetrical skewedtotheleft skewedtotheright noneofthesealternativesiscorrect ANSWER: c Inascatterdiagram,alinethatprovidesanapproximationoftherelationshipbetweenthevariablesisknownas approximationline trendline lineofzerointercept lineofzeroslope ANSWER: b Ahistogramis agraphicalpresentationofafrequencyorrelativefrequencydistribution
histogram boxplot dotplot crosstabulation ANSWER: c datadashboard datacomputation hypothesistesting organizationofthehypothesis ANSWER: a Alinethatprovidesanapproximationoftherelationshipbetweentwovariablesisknownasthe relationshipline Trendline lineof2variables approximationoftwovariables ANSWER: b Afrequencydistributionisatabularsummaryofdatashowingthe fractionofitemsinseveralclasses percentageofitemsinseveralclasses relativepercentageofitemsinseveralclasses numberofitemsinseveralclasses ANSWER: d Exhibit2-1 Thenumberofhoursworked(perweek)by400statisticsstudentsareshownbelow. NumberofHours Frequency 0- 9 20 10 -19 80 20 -29 200 30 -39 100 RefertoExhibit2-1.Theclasswidthforthisdistribution is9
is10 is39,whichis:thelargestvalueminusthesmallestvalueor39-0 =39 variesfromclasstoclass ANSWER: b RefertoExhibit2-1.Thenumberofstudentsworking19hoursorless is80 is 100 is 180 is 300 ANSWER: b RefertoExhibit2-1.Therelativefrequencyofstudentsworking9hoursorless is20 is 100 ANSWER: d RefertoExhibit2-1.Thepercentageofstudentsworking19hoursorlessisa.20% b.25% c.75% d.80% ANSWER: b RefertoExhibit2-1.Thecumulativerelativefrequencyfortheclassof20-29 is 300 is0.25 is0.75 is0.5 ANSWER: c RefertoExhibit2-1.Thecumulativepercentfrequencyfortheclassof30-39isa.100% b.75% c.50% d.25% ANSWER: a RefertoExhibit2-1.Thecumulativefrequencyfortheclassof20-29 is 200