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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall
Statistics for the Sciences (03 65 205)
Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
1.Whichofthefollowingchoicesisastatementobtainedbyapplyingdescriptivestatisticstoanexperimentinwhich
therunningspeedoffourdogsA,B,C,andDwasmeasured?
a.Theaveragerunningspeedofthefourdogsis28km/h.
b.Onedogrunsat42km/h.
c.DogBrunsfasterthandogC.
d.DogsAandCrunatthesamespeed. ANSWER:a
2.Howistherelativefrequencyofaclasscomputed?
a.bydividingthefrequencyoftheclassbythenumberofclasses
b.bydividingthefrequencyoftheclassbytheclasswidth
c.bydividingthefrequencyoftheclassbythetotalnumberofobservationsinthedataset
d.bydividingthefrequencyoftheclassbyonelessthanthetotalnumberofobservationsinthedataset ANSWER:c
3.WhichofthefollowingisNOTagoalofdescriptivestatistics? a.summarizingdata
b.displayingaspectsofthecollecteddata
c.reportingnumericalfindings
d.estimatingcharacteristicsofpopulations ANSWER:d
4.YouaskedsevenofyourfriendsabouthowmanysongstheydownloadedfromiTuneslastmonthandcomputed
theaveragetobe6.3songs.Basedonthisinformation,youestimatedthat,onaverage,allyourfriends
downloaded6.3songslastmonth.Whatisthisanexampleof? a.descriptivestatistics b.apopulation c.asample d.statisticalinference ANSWER:d
5.Whichofthefollowingisthebesttypeofchartforcomparingtwosetsofqualitativedata? a.alinechart b.adotplot
c.astemandleafplot d.abarchart ANSWER:d 2 0
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
6.Whatdoesthesumofthefrequenciesforallclassesalwaysequal?
a.thenumberofclasses b.theclasswidth
c.thetotalnumberofobservationsinthedataset d.one ANSWER:c
7.Whatarethetwographicaltechniquesmostcommonlyusedtopresentqualitativedata?
a.barchartandhistogram
b.barchartandpiechart
c.linechartandpiechart
d.linechartandhistogram ANSWER:b
8.Whatarethecharacteristicsofexperimentalunitsgenerallycalled? a.datasets b.descriptivestatistics c.internaldata d.variables ANSWER:d
9.Statisticianswouldliketofindouttheaverageincomeofthepopulationofyoungpeople(aged20–29)inOntario.
WhichofthefollowingtheyshouldNOTtakeasasample?
a.1,000peopleaged20–29wholiveintheKitchener-Waterlooarea
b.300peopleaged20–29wholiveinNorthernOntario
c.1,000peopleaged20–29wholiveinMontreal
d.200peopleaged20–29wholiveinToronto ANSWER:c
10.Whichofthefollowingtermsreferstothesetofallpossibleobservationsaboutaspecifiedcharacteristicof interest? a.aframe
b.amultinomialdataset
c.anobservationalstudy d.apopulation ANSWER:d
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
11.Whatistheresultcalledwhenasinglevariableismeasuredonasingleexperimentalunit? a.afrequencyunit b.anelementaryunit c.asample d.univariatedata ANSWER:d
12.Whichofthefollowingtermsreferstoagraphicalpresentationofdatathatisdisplayedinorderofdescending magnitude? a.alinechart
b.astemandleafplot
c.arelativefrequencyhistogram d.aParetochart ANSWER:d
13.Amarketshareof56.3%canberepresentedinapiechartbyaslicehavingacentralanglemeasuredindegrees.
Inthiscase,whatwouldbethesizeofthecentralangleofthemarketshare? a.39.3degrees b.78.5degrees c.202.7degrees d.141.3degrees ANSWER:c
14.Whichofthefollowinggraphicsisthemostimportantandmostcommonlyusedgraphicalpresentationof quantitativedata? a.thebarchart b.thehistogram c.thepiechart d.thedotplot ANSWER:b
15.Whichofthefollowingquantitiesisadiscretevariable?
a.numberofstudentsenrolledinauniversity
b.flighttimebetweenNewYorkCity,USAandLondon,England
c.speedofanexpresstraintravellingfromToronto,OntariotoOttawa,Ontario
d.numberofcaloriesburnedduringa20-minuteexerciseclass ANSWER:a
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
16.Onwhatdoesthetotalareaofthebarsinarelativefrequencyhistogramdepend? a.thesamplesize b.thenumberofbars
c.thewidthofeachbar d.thepopulationsize ANSWER:c
17.Ingeneral,howdodatadistributionsofincomesofemployeesinlargefirmstendtobeshaped?
a.Theyaremostoftenskewedtotheright.
b.Theyaremostoftenskewedtotheleft.
c.Theyaregenerallysymmetricaboutthemean.
d.Theyaregenerallysymmetricaboutthemedian. ANSWER:a
18.Whichofthefollowingnumbersconstitutesthesumoftherelativefrequenciesfoundinarelativefrequency
distributionforquantitativedata? a.0 b.1 c.2 d.3 ANSWER:b
19.Whichofthefollowingbestdescribestheterm“relativeclassfrequency”?
a.Itisthenumberofobservationsthatfallintoagivenclassinafrequencydistribution.
b.Itistheproportionofallobservationsthatfallintoagivenclassinafrequencydistribution.
c.Itisthedifferencebetweenthenumericallowerandupperlimitsofaclassofquantitativedata.
d.Itistheaveragenumberofobservationsthatfallintoagivenclassinafrequencydistribution. ANSWER:b
20.Supposeyouhave350observationsdividedintoclasses.Oneoftheclasseshasadataclassfrequencyof134.
Whatisitsrelativeclassfrequency? a.0.38 b.0.18 c.0.22 d.0.36 ANSWER:a
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
21.Supposeyouaregivenagraphicalportrayalofarelativefrequencydistributionofcontinuousquantitativedata
withthefollowingcharacteristics.Thelowerandupperlimitsofthedataclassesareidentifiedbytickmarksona
horizontalaxis.Thecorrespondingrelativeclassfrequenciesarerepresentedbytheareasofverticalrectangles
connectedtoeachotherandpositionedontopofeachoftheseclassintervals.Whatissuchagraphical presentationcalled? a.astackedbarchart b.aParetochart c.apictogram
d.arelativefrequencyhistogram ANSWER:d
22.Ahistogramisagraphicaldevice.Whatkindofdataisitcommonlyusedtodisplay? a.timeseriesdata b.quantitativedata c.qualitativedata d.categoricaldata ANSWER:b
23.Howmanyclassesshouldgenerallybeusedwhenconstructingarelativefrequencyhistogram?
a.between1and5classes
b.between1and10classes
c.between5and12classes
d.between5and20classes ANSWER:c
24.Whichofthefollowingsetsofnumberscouldrepresentrelativefrequenciesforsomedataset?
a.0.07,0.07,0.44,0.06,0.36
b.0.1,0.1,0.1,0.2,0.2,0.2,0.2
c.0.05,0.25,0.35,0.55 d.1/3,1/4,1/5,1/6 ANSWER:a
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
25.Whichofthefollowingmightbestbedisplayedusingabarchart? a.timeseriesdata b.continuousvariables c.qualitativevariables d.quantitativevariables ANSWER:c
26.Astemandleafplotisusedtodisplaythedistributionofwhichofthefollowingkindsofdata? a.qualitativedata b.quantitativedata
c.twoquantitativevariables
d.twoqualitativevariables ANSWER:b
27.IfaYouTubeanalystwantstoseethetrendintypesofYouTubevideoswatchedoverthepastfiveyears,whichof
thefollowingisthemosteffectivetypeofgraphtouse? a.alinechart b.apiechart c.ahistogram d.abarchart
ANSWER:d Đáp án là a
28.Consumerpreferenceforbananas,apples,oranges,andkiwiisdepictedinapiechartwiththefollowingsector
angles:108oforbananas,122oforapples,70ofororanges,and60oforkiwi.Whichofthefollowingstatements istrue?
a.tenconsumerspreferorangestokiwi
b.10.8%ofconsumerspreferbananas
c.one-thirdofconsumerspreferapples
d.30%ofconsumerspreferbananas ANSWER:d
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
29.Accordingtothefivemostrecentcensuses,thepopulationofCanadahasbeen(inthousands):27,297in1991,
28,847in1996,30,007in2001,31,613in2006,and33,477in2011.Youneedtodepictthedatausingaline
chart.Whatwillyoudotostart?
a.markyearsontheverticalaxisandpopulationonthehorizontalaxis
b.computethesizesoftheconsecutiveincreasesinpopulation
c.markyearsonthehorizontalaxisandpopulationontheverticalaxis
d.computerelativefrequencies ANSWER:c
30.Avariableisacharacteristicthatchangesovertime,and/orvariesfordifferentindividualsorobjectsunder
consideration.Anexperimentalunitistheindividualorobjectonwhichavariableismeasured. a.True b.False ANSWER:True
31.Barandpiechartsaregraphicaltechniquesforqualitativedata.Theformerfocustheattentiononthefrequencyof
theoccurrencesofthecategories;thelatteremphasizethepercentageofoccurrencesofeachcategory. a.True b.False ANSWER:True
32.Among3,000first-yearundergraduatestudentsinauniversity,245,or8.2%,arecomputersciencemajors.This
isanexampleofstatisticalinference. a.True b.False ANSWER:False
33.Individualobservationswithineachclassmaybefoundina . a.True b.False ANSWER:False
34.Twenty-fivepercentofasampleof200professionaltennisplayersindicatedthattheirparentsdidnotplaytennis.
Thisisanexampleofdescriptivestatistics,ratherthaninferentialstatistics. a.True b.False ANSWER:True
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
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Chapter1—DescribingDatawithGraphs
35.Alocalcablesystemusingasampleof1000subscribersestimatesthat50%ofitssubscriberswatchpremium
channelsatleastfivetimesperweek.Thisisanexampleofinferentialstatistics,asopposedtodescriptive statistics. a.True b.False ANSWER:True
36.Statisticalinferenceistheprocessofmakinganestimate,prediction,ordecisionaboutapopulationbasedon sampledata. a.True b.False ANSWER:True
37.Intheterm“frequencydistribution,”frequencyreferstothenumberofdatavaluesormeasurementsfallingwithin eachcategory. a.True b.False ANSWER:True
38.Abranchofthestatisticsdisciplinethatisusedtodevelopandutilizetechniquesforeffectivelypresenting
numericalinformationiscalledinferentialstatistics. a.True b.False ANSWER:False
39.Avariablethatismeasuredonanexperimentalunitiscalledameasurement. a.True b.False ANSWER:True
40.Avariableisacharacteristicthatcanchangeorvaryovertime. a.True b.False ANSWER:True
41.Aqualitativevariableaboutwhichobservationscanbemadeinonlytwocategoriesisabivariatedataset. a.True b.False ? ANSWER:False
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
42.Avariablethatisnormallydescribedinwords,ratherthannumericallypresented,isaqualitativevariable. a.True b.False ANSWER:True
43.Adiscretequantitativevariablecanassumefiniteorcountablenumberofvalues. a.True b.False ANSWER:True
44.Acontinuousquantitativevariableisonethatmayassumeanyvaluewithinanintervalofrealnumbers. a.True b.False ANSWER:True 45. ANSWER:False 46. ANSWER:True 47. frequency distribut ANSWER:False
48.Arelativefrequencydistributionisatabularsummaryofadatasetshowingtheproportionsofallobservations
whichfallintoeachofseveralcollectivelyexhaustiveandmutuallyexclusiveclasses. a.True b.False ANSWER:True
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Test Bank for Introduction to Probability and Statistics 4th Canadian Edition by Mendenhall F N u a llm
fei:le at https://TestbankDirect.eu/ Class: Date:
Chapter1—DescribingDatawithGraphs
49.Measuringtheheightofthebasketballplayersonateamgeneratesunivariatedata. a.True b.False ANSWER:True
50.Adistributionthathastwopeaksiscalledunimodal. a.True b.False
ANSWER:False unimodal là one peak, bimodal là two peaks
51.Multivariatedataresultwhenmorethantwovariablesaremeasuredonasingleexperimentalunit. a.True b.False ANSWER:True
52.Whenconstructingafrequencydistributionforcategoricaldata,itisalwaysnecessarytodevelopclass boundaries. a.True b.False ANSWER:False 53. ANSWER:True 54. ANSWER:True
55.Inconstructingapiechartforacategoricalvariable,onesectorofthepieisassignedtoeachcategoryofthe variable. a.True b.False ANSWER:True
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