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Chapter07-SamplingandSamplingDistributions
CopyrightCengageLearning.PoweredbyCognero.
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PAGE
MultipleChoice
1.
Fromagroupof12students,wewanttoselectarandomsampleof5studentstoserveonauniversitycommittee.Howmanycombinationsofrandomsamplesof5studentscanbeselected?
a.
60
b.
95,040
c.
25
d.
792
ANSWER:
d
2.
Parametersare
a.
numericalcharacteristicsofasample.
b.
numericalcharacteristicsofapopulation.
c.
theaveragestakenfromasample.
d.
numericalcharacteristicsofeitherasampleorapopulation.
ANSWER:
b
3.
Howmanysimplerandomsamplesofsize3canbeselectedfromapopulationofsize8?
a.
336
b.
24
c.
56
d.
6561
ANSWER:
c
4.
Howmanysimplerandomsamplesofsize4canbeselectedfromapopulationofsize8?
a.
32
b.
4
c.
1680
d.
70
ANSWER:
d
5.
Samplingdistributionof
isthe
a.
probabilitydistributionofthesamplemean.
b.
probabilitydistributionofthesampleproportion.
c.
meanofthesample.
d.
meanofthepopulation.
ANSWER:
a
6.
Asimplerandomsampleof100observationswastakenfromalargepopulation.Thesamplemeanandthestandarddeviationweredeterminedtobe50and5,respectively.Thestandarderrorofthemeanis
a.
0.5.
b.
2.
c.
5.
d.
10.
ANSWER:
a
7.
Asimplerandomsampleof100observationswastakenfromalargepopulation.Thesamplemeanandthestandarddeviationweredeterminedtobe1234and120respectively.Thestandarderrorofthemeanis
a.
1234±120.
b.
120.
c.
1.2.
d.
12.
ANSWER:
d
8.
Apopulationhasastandarddeviationof16.Ifasampleofsize64isselectedfromthispopulation,whatistheprobabilitythatthesamplemeanwillbewithin±2ofthepopulationmean?
a.
0.6826
b.
0.3413
c.
-0.6826
d.
Sincethemeanisnotgiven,thereisnoanswertothisquestion.
ANSWER:
a
9.
Theprobabilitydistributionofallpossiblevaluesofthesampleproportion
isthe
a.
probabilitydensityfunctionof.
b.
samplingdistributionof.
c.
sameas,sinceitconsidersallpossiblevaluesofthesampleproportion.
d.
samplingdistributionof.
ANSWER:
d
10.
Incomputingthestandarderrorofthemean,thefinitepopulationcorrectionfactorisusedwhen
a.
N/n>0.05.
b.
N/n0.05.
c.
n/N>0.05.
d.
n/N30.
ANSWER:
c
11.
Conveniencesamplingisanexampleof_____
sampling.
a.
probabilistic
b.
stratified
c.
nonprobabilistic
d.
cluster
ANSWER:
c
12.
Whichofthefollowingisanexampleofnonprobabilisticsampling?
a.
Simplerandomsampling
b.
Stratifiedsimplerandomsampling
c.
Clustersampling
d.
Judgmentsampling
ANSWER:
d
13.
Apopulationconsistsof500elements.Wewanttodrawasimplerandomsampleof50elementsfromthispopulation.Onthefirstselection,theprobabilityofanelementbeingselectedis
a.
0.100.
b.
0.010.
c.
0.001.
d.
0.002.
ANSWER:
d
14.
Thecloserthesamplemeanistothepopulationmean,
a.
thelargerthesamplingerror.
b.
thesmallerthesamplingerror.
c.
thesamplingerrorequals1.
d.
noneofthesealternativesiscorrect.
ANSWER:
b
15.
Asthesamplesizeincreases,the
a.
standarddeviationofthepopulationdecreases.
b.
populationmeanincreases.
c.
standarderrorofthemeandecreases.
d.
standarderrorofthemeanincreases.
ANSWER:
c
16.
Asimplerandomsamplefromaninfinitepopulationisasampleselectedsuchthat
a.
eachelementisselectedindependentlyandfromthesamepopulation.
b.
eachelementhasa0.5probabilityofbeingselected.
c.
eachelementhasaprobabilityofatleast0.5ofbeingselected.
d.
theprobabilityofbeingselectedchanges.
ANSWER:
a
17.
Apopulationconsistsof15items.Thenumberofdifferentsimplerandomsamplesofsize3thatcanbeselectedfromthispopulationis
a.
45.
b.
455.
c.
3375.
d.
2730.
ANSWER:
b
18.
Inpointestimation
a.
datafromthepopulationisusedtoestimatethepopulationparameter.
b.
datafromthesampleisusedtoestimatethepopulationparameter.
c.
datafromthesampleisusedtoestimatethesamplestatistic.
d.
themeanofthepopulationequalsthemeanofthesample.
ANSWER:
b
19.
Thesamplestatisticsisthepointestimatorof
a.
μ.
b.
σ.
c.
.
d.
.
ANSWER:
b
20.
Thesamplemeanisthepointestimatorof
a.
μ.
b.
σ.
c.
.
d.
.
ANSWER:
a
21.
Ifweconsiderthesimplerandomsamplingprocessasanexperiment,thesamplemeanis
a.
alwayszero.
b.
alwayssmallerthanthepopulationmean.
c.
arandomvariable.
d.
exactlyequaltothepopulationmean.
ANSWER:
c
22.
Asthesamplesizebecomeslarger,thesamplingdistributionofthesamplemeanapproachesa_____
distribution.
a.
Binomial
b.
Poisson
c.
Normal
d.
Chi-square
ANSWER:
c
23.
Wheneverthepopulationhasanormalprobabilitydistribution,thesamplingdistributionofisanormalprobabilitydistributionfor
a.
largesamplesizes.
b.
smallsamplesizes.
c.
anysamplesize.
d.
samplesofsizethirtyorgreater.
ANSWER:
c
24.
Thesamplingerroristhe
a.
sameasthestandarderrorofthemean.
b.
differencebetweenthevalueofthesamplemeanandthevalueofthepopulationmean.
c.
errorcausedbyselectingabadsample.
d.
standarddeviationmultipliedbythesamplesize.
ANSWER:
b
25.
Thestandarddeviationofasampleof100elementstakenfromaverylargepopulationisdeterminedtobe60.Thevarianceofthepopulation
a.
cannotbelargerthan60.
b.
cannotbelargerthan3600.
c.
mustbeatleast100.
d.
canbeanyvaluegreaterorequaltozero.
ANSWER:
d
26.
Fromapopulationof200elements,asampleof49elementsisselected.Itisdeterminedthatthesamplemeanis56andthesamplestandarddeviationis14.Thestandarderrorofthemeanis
a.
3.
b.
2.
c.
greaterthan2.
d.
lessthan2.
ANSWER:
d
27.
Theprobabilitydistributionofallpossiblevaluesofthesamplemean
is
a.
theprobabilitydensityfunctionof.
b.
thesamplingdistributionof.
c.
thegrandmean,sinceitconsidersallpossiblevaluesofthesamplemean.
d.
one,sinceitconsidersallpossiblevaluesofthesamplemean.
ANSWER:
b
28.
Whichofthefollowingsamplingmethodsdoesnotleadtoprobabilitysamples?
a.
Stratifiedsampling
b.
Clustersampling
c.
Systematicsampling
d.
Conveniencesampling
ANSWER:
d
29.
Whichofthefollowingis(are)pointestimator(s)?
a.
σ
b.
μ
c.
s
d.
α
ANSWER:
c
30.
Aprobabilitydistribution
ofallpossiblevaluesofasamplestatisticisknownas
a.
asamplestatistic.
b.
aparameter.
c.
simplerandomsampling.
d.
asamplingdistribution.
ANSWER:
d
31.
Apopulationhasameanof300andastandarddeviationof12.Asampleof64observationswillbetaken.Theprobabilitythatthesamplemeanwillbebetween295to305is
a.
0.0009.
b.
0.9991.
c.
0.3231.
d.
0.6769.
ANSWER:
b
32.
Thestandarddeviationofapointestimatoriscalledthe
a.
standarddeviation.
b.
standarderror.
c.
pointestimator.
d.
varianceofestimation.
ANSWER:
b
33.
Asinglenumericalvalueusedasanestimateofapopulationparameterisknownasa
a.
parameter.
b.
populationparameter.
c.
meanestimator.
d.
pointestimate.
ANSWER:
d
34.
Thesamplestatistic,suchas,s,or,thatprovidesthepointestimateofthepopulationparameterisknownasa
a.
pointestimator.
b.
parameter.
c.
populationparameter.
d.
populationstatistic.
ANSWER:
a
35.
Thepurposeofstatisticalinferenceistoprovideinformationaboutthe
a.
samplebaseduponinformationcontainedinthepopulation.
b.
populationbaseduponinformationcontainedinthesample.
c.
populationbaseduponinformationcontainedinthepopulation.
d.
meanofthesamplebaseduponthemeanofthepopulation.
ANSWER:
b
36.
Asimplerandomsampleof36observationswastakenfromalargepopulation.Thesamplemeanandthestandarddeviationweredeterminedtobe360and120respectively.Thestandarderrorofthemeanis
a.
3.33.
b.
3.
c.
10.
d.
20.
ANSWER:
d
37.
Randomsamplesofsize64aretakenfromaninfinitepopulationwhosemeanandstandarddeviationare240and16,respectively.Thedistributionofthepopulationisunknown.Themeanandthestandarderrorofthemeanare
a.
240and16.
b.
64and16.
c.
8and2.
d.
240and2.
ANSWER:
d
38.
Apopulationhasameanof60andastandarddeviationof18.Asampleof81observationswillbetaken.Theprobabilitythatthesamplemeanwillbelargerthan64is
a.
0.5228.
b.
0.9772.
c.
0.4772.
d.
0.0228.
ANSWER:
d
39.
Apopulationhasameanof180andastandarddeviationof36.Asampleof84observationswillbetaken.Theprobabilitythatthesamplemeanwillbebetween181and185is
a.
0.2980.
b.
0.7020.
c.
0.2989.
d.
0.7011.
ANSWER:
a
40.
Randomsamplesofsize600aretakenfromaninfinitepopulationwhosepopulationproportionis0.4.Thestandarddeviationofthesampleproportions(i.e.,thestandarderroroftheproportion)is
a.
0.0004.
b.
0.2400.
c.
0.4000.
d.
0.0200.
ANSWER:
d
41.
Asampleof400observationswillbetakenfromaninfinitepopulation.Thepopulationproportionequals0.8.Theprobabilitythatthesampleproportionwillbegreaterthan0.75is
a.
0.8764.
b.
0.1236.
c.
0.9938.
d.
0.0062.
ANSWER:
c
42.
Fromapopulationof500elements,asampleof225elementsisselected.Itisknownthatthevarianceofthepopulationis900.Thestandarderrorofthemeanisapproximately
a.
1.1022.
b.
2.
c.
30.
d.
1.4847.
ANSWER:
d
43.
AsimplerandomsampleofsizenfromaninfinitepopulationofsizeNistobeselected.Eachpossiblesampleshouldhave_____
ofbeingselected.
a.
thesameprobability
b.
aprobabilityof1/n
c.
aprobabilityof1/N
d.
aprobabilityofN/n
ANSWER:
a
44.
Arandomsampleof525peoplewastakenfromaverylargepopulation.225ofthepeopleinthesamplewerefemale.Thestandarderroroftheproportionis
a.
0.9783.
b.
0.0217.
c.
0.9668.
d.
0.0332.
ANSWER:
b
45.
Forapopulationwithanydistribution,theformofthesamplingdistributionofthesamplemeanis
a.
sometimesnormalforallsamplesizes.
b.
sometimesnormalforlargesamplesizes.
c.
alwaysnormalforallsamplesizes.
d.
alwaysnormalforlargesamplesizes.
ANSWER:
d
46.
Thereare7childreninafamily.Thenumberofchildrendefinesapopulation.Thenumberofsimplerandomsamplesofsize2(withoutreplacement)whicharepossibleequals
a.
14.
b.
21.
c.
5.
d.
42.
ANSWER:
b
47.
Asimplerandomsampleof5observationsfromapopulationcontaining400elementswastaken,andthefollowingvalueswereobtained.
15
19
21
24
31
Apointestimateofthemeanis
a.
4.
b.
22.
c.
21.
d.
110.
ANSWER:
b
48.
Randomsamplesofsize49aretakenfromapopulationthathas200elements,ameanof180,andavarianceof196.Thedistributionofthepopulationisunknown.Thestandarderrorofthemeanis
a.
24.39.
b.
28.
c.
2.
d.
1.74.
ANSWER:
d
49.
Randomsamplesofsize64aretakenfromaninfinitepopulationwhosemeanandstandarddeviationare24and6.4,respectively.Thedistributionofthepopulationisunknown.Themeanandthestandarderrorofthemeanare
a.
64and6.4.
b.
64and0.8.
c.
24and6.4.
d.
24and0.8.
ANSWER:
d
50.
Asampleof24observationsistakenfromapopulationthathas150elements.Thesamplingdistributionof
is
a.
approximatelynormalbecause
isalwaysapproximatelynormallydistributed.
b.
approximatelynormalbecausethesamplesizeislargeincomparisontothepopulationsize.
c.
approximatelynormalbecauseofthecentrallimittheorem.
d.
normalifthepopulationisnormallydistributed.
ANSWER:
d
51.
Asampleof92observationsistakenfromaninfinitepopulation.Thesamplingdistributionof
isapproximately
a.
normalbecause
isalwaysapproximatelynormallydistributed.
b.
normalbecausethesamplesizeissmallincomparisontothepopulationsize.
c.
normalbecauseofthecentrallimittheorem.
d.
noneofthesealternativesiscorrect.
ANSWER:
c
52.
Apopulationhasameanof125andastandarddeviationof16.Asampleof64observationswillbetaken.Theprobabilitythatthesamplemeanwillbebetween122.4and126.1is
a.
0.1821.
b.
0.0919.
c.
0.6120.
d.
0.3880.
ANSWER:
c
53.
Apopulationhasameanof400andastandarddeviationof25.Asampleof100observationswillbetaken.Theprobabilitythatthesamplemeanwillbegreaterthan405is
a.
.9772.
b.
.0228.
c.
.4207.
d.
.3805.
ANSWER:
b
54.
Randomsamplesofsize400aretakenfromaninfinitepopulationwhosepopulationproportionis0.2.Themeanandstandarddeviationofthesampleproportionare
a.
0.2and.04.
b.
0.2and0.02.
c.
20and.04.
d.
20and0.02.
ANSWER:
b
55.
Apopulationofsize1,000hasaproportionof0.5.Therefore,theproportionandthestandarddeviationofthesampleproportionforsamplesofsize100are
a.
500and0.047.
b.
500and0.050.
c.
0.5and0.047.
d.
0.5and0.050.
ANSWER:
c
56.
Asampleof25observationsistakenfromaninfinitepopulation.Thesamplingdistributionof
is
a.
notnormalsincen<30.
b.
approximatelynormalbecause
isalwaysnormallydistributed.
c.
approximatelynormalifnp5andn(1-P)5.
d.
approximatelynormalifnp>30andn(1-P)>30.
ANSWER:
c
57.
Asampleof66observationswillbetakenfromaninfinitepopulation.Thepopulationproportionequals0.12.Theprobabilitythatthesampleproportionwillbelessthan0.1969is
a.
0.0955.
b.
0.9045.
c.
0.0273.
d.
0.9727.
ANSWER:
d
58.
AsAsampleof51observationswillbetakenfromaninfinitepopulation.Thepopulationproportionequals0.85.Theprobabilitythatthesampleproportionwillbebetween0.8327and0.8631is
a.
0.9998.
b.
0.0002.
c.
0.2387.
d.
0.7613.
ANSWER:
c
59.
Asubsetofapopulationselectedtorepresentthepopulationisa
a.
subset.
b.
sample.
c.
smallpopulation.
d.
parameter.
ANSWER:
b
60.
Afinitepopulationcorrectionfactorisneededincomputingthestandarddeviationofthesamplingdistributionofsamplemeans
a.
wheneverthepopulationisinfinite.
b.
wheneverthesamplesizeismorethan5%ofthepopulationsize.
c.
wheneverthesamplesizeislessthan5%ofthepopulationsize.
d.
irrespectiveofthesizeofthesample.
ANSWER:
b
61.
Doublingthesizeofthesamplewill
a.
reducethestandarderrorofthemeantoone-halfitscurrentvalue.
b.
reducethestandarderrorofthemeantoapproximately70%ofitscurrentvalue.
c.
havenoeffectonthestandarderrorofthemean.
d.
doublethestandarderrorofthemean.
ANSWER:
b
62.
Thefactthatthesamplingdistributionofsamplemeanscanbeapproximatedbyanormalprobabilitydistributionwheneverthesamplesizeislargeisbasedonthe
a.
centrallimittheorem.
b.
factthatwehavetablesofareasforthenormaldistribution.
c.
assumptionthatthepopulationhasanormaldistribution.
d.
noneofthesealternativesiscorrect.
ANSWER:
a
63.
Asthesamplesizeincreases,thevariabilityamongthesamplemeans
a.
increases.
b.
decreases.
c.
remainsthesame.
d.
dependsuponthespecificpopulationbeingsampled.
ANSWER:
b
64.
Asaruleofthumb,thesamplingdistributionofthesampleproportionscanbeapproximatedbyanormalprobabilitydistributionwhenever
a.
np≥5,n≥30.
b.
np≥5andn(1-p)≥5.
c.
n30and(1-p)=0.5.
d.
noneofthesealternativesiscorrect.
ANSWER:
b
65.
Randomsamplesofsize17aretakenfromapopulationthathas200elements,ameanof36,andastandarddeviationof8.Themeanandthestandarddeviationofthesamplingdistributionofthesamplemeansare
a.
8.7and1.94.
b.
36and1.94.
c.
36and1.86.
d.
36and8.
ANSWER:
c
66.
Randomsamplesofsize17aretakenfromapopulationthathas200elements,ameanof36,andastandarddeviationof8.Whichofthefollowingbestdescribestheformofthesamplingdistributionofthesamplemeanforthissituation?
a.
Approximatelynormalbecausethesamplesizeissmallrelativetothepopulationsize
b.
Approximatelynormalbecauseofthecentrallimittheorem
c.
Exactlynormal
d.
Noneofthesealternativesiscorrect.
ANSWER:
d
67.
Thesamplingdistributionofthesamplemeans
a.
istheprobabilitydistributionshowingallpossiblevaluesofthesamplemean.
b.
isusedasapointestimatorofthepopulationmeanμ.
c.
isanunbiasedestimator.
d.
showsthedistributionofallpossiblevaluesofμ.
ANSWER:
a
68.
Clustersamplingis
a.
anonprobabilitysamplingmethod.
b.
thesameasconveniencesampling.
c.
aprobabilitysamplingmethod.
d.
asystematicsamplingmethod.
ANSWER:
c
69.
Thenumberofdifferentsimplerandomsamplesofsize5thatcanbeselectedfromapopulationofsize10is
a.
50
b.
30,240
c.
2
d.
252
ANSWER:
d
70.
Thefollowingdatawascollectedfromasimplerandomsampleofapopulation.
13
17
18
21
23
Thepointestimateofthepopulationmean
a.
cannotbedetermined,sincethepopulationsizeisunknown.
b.
is18.4.
c.
is18.
d.
is92.
ANSWER:
b
71.
Thefollowingdatawascollectedfromasimplerandomsampleofapopulation.
13
17
18
21
23
Thepointestimateofthepopulationstandarddeviationis
a.
3.441.
b.
3.847.
c.
14.8.
d.
11.84.
ANSWER:
a
72.
Thefollowingdatawascollectedfromasimplerandomsampleofapopulation.
13
15
14
16
12
Ifthepopulationconsistedof10elements,howmanydifferentrandomsamplesofsize6couldbedrawnfromthepopulation?
a.
2
b.
50
c.
252
d.
30,240
ANSWER:
c
73.
Thefollowingdatawascollectedfromasimplerandomsampleofapopulation.
13
15
14
16
12
Themeanofthepopulation
a.
is14.
b.
is15.
c.
is15.1581.
d.
couldbeanyvalue.
ANSWER:
d
74.
Fourhundredpeoplewereaskedwhethergunlawsshouldbemorestringent.Threehundredsaid"yes,"and100said"no".Thepointestimateoftheproportioninthepopulationwhowillrespond"yes"is
a.
300.
b.
approximately300.
c.
0.75.
d.
0.25.
ANSWER:
c
75.
Fourhundredpeoplewereaskedwhethergunlawsshouldbemorestringent.Threehundredsaid"yes,"and100said"no".Thepointestimateoftheproportioninthepopulationwhowillrespond"no"is
a.
75.
b.
0.25.
c.
0.75.
d.
0.50.
ANSWER:
b
76.
Thefollowinginformationwascollectedfromasimplerandomsampleofapopulation.
9
13
15
15
21
24
Thepointestimateofthemeanofthepopulationis
a.
14.5.
b.
15.
c.
6.
d.
16.
ANSWER:
a
77.
Thefollowinginformationwascollectedfromasimplerandomsampleofapopulation.
9
13
15
15
21
24
Thepointestimateofthepopulationstandarddeviationis
a.
7.018.
b.
59.1.
c.
7.688.
d.
49.25.
ANSWER:
c
78.
Howmanydifferentsamplesofsize4canbetakenfromafinitepopulationofsize12?
a.
48
b.
11,880
c.
3
d.
495
ANSWER:
d
79.
Arandomsampleof144bottlesofcologneshowedanaveragecontentof4ounces.Itisknownthatthestandarddeviationofthecontents(i.e.,ofthepopulation)is0.3ounces.Thestandarderrorofthemeanequals
a.
0.3333.
b.
0.15.
c.
0.025.
d.
4.000.
ANSWER:
c
80.
Arandomsampleof144bottlesofcologneshowedanaveragecontentof4ounces.Itisknownthatthestandarddeviationofthecontents(i.e.,ofthepopulation)is0.3ounces.
Thepointestimateofthemeancontentofthebottlesis
a.
0.3.
b.
4.
c.
144.
d.
2.
ANSWER:
b
81.
Arandomsampleof144bottlesofcologneshowedanaveragecontentof4ounces.Itisknownthatthestandarddeviationofthecontents(i.e.,ofthepopulation)is0.3ounces.Inthisproblemthe0.3is
a.
aparameter.
b.
astatistic.
c.
thestandarderrorofthemean.
d.
theaveragecontentofcolognesinthelongrun.
ANSWER:
a
82.
Inalocaluniversity,70%ofthestudentsliveinthedormitories.Arandomsampleof75studentsisselectedforaparticularstudy.Thestandarddeviationof,knownasthestandarderroroftheproportionisapproximately
a.
0.5292.
b.
5.2915.
c.
0.0529.
d.
52.915.
ANSWER:
c
83.
Inalocaluniversity,70%ofthestudentsliveinthedormitories.Arandomsampleof75studentsisselectedforaparticularstudy.
Theprobabilitythatthesampleproportion(theproportionlivinginthedormitories)isbetween0.69and0.72is
a.
0.7778.
b.
0.2222.
c.
0.2347.
d.
0.7653.
ANSWER:
b
84.
Inalocaluniversity,70%ofthestudentsliveinthedormitories.Arandomsampleof75studentsisselectedforaparticularstudy.
Theprobabilitythatthesampleproportion(theproportionlivinginthedormitories)isatleast0.60is
a.
0.0294.
b.
0.9706.
c.
0.0228.
d.
0.9772.
ANSWER:
b
85.
Theexpectedvalueofequalsthemeanofthepopulationfromwhichthesampleisdrawn?
a.
?onlyifthesamplesizeis30orgreater.
b.
?onlyifthesamplesizeis50orgreater.
c.
?onlyifthesamplesizeis100orgreater.
d.
?foranysamplesize.
ANSWER:
d
86.
Thestandarddeviationof
isreferredtoasthe_____proportion.
a.
standard
b.
samplemean
c.
deviated
d.
standarderrorofthe
ANSWER:
d
87.
Thevalueofthe_____isusedtoestimatethevalueofthepopulationparameter
a.
populationstatistic
b.
sampleparameter
c.
populationestimate
d.
samplestatistic
ANSWER:
d
88.
Thestandarddeviationofisreferredtoasthe?
a.
?standardmeanofx.
b.
?standarderrorofthemean.
c.
?samplestandardmean.
d.
?samplemeandeviation.
ANSWER:
b
89.
Thepopulationbeingstudiedisusuallyconsidered_____ifitinvolvesanongoingprocessthatmakeslistingorcountingeveryelementinthepopulationimpossible.
a.
finite
b.
infinite
c.
skewed
d.
symmetric
ANSWER:
b
90.
Aprobabilitysamplingmethodinwhichwerandomlyselectoneofthefirstkelementsandthenselecteverykthelementthereafteris_____
sampling.
a.
stratifiedrandom
b.
cluster
c.
systematic
d.
convenience
ANSWER:
c
91.
AsimplerandomsampleofsizenfromafinitepopulationofsizeNisasampleselectedsuchthateachpossiblesampleofsize_____
ofbeingselected.
a.
Nhasthesameprobability
b.
nhasaprobabilityof0.5
c.
nhasaprobabilityof0.1
d.
nhasthesameprobability
ANSWER:
d
92.
Thepopulationwewanttomakeinferencesaboutisth?e
a.
?sampledpopulation.
b.
?frame.
c.
?targetpopulation.
d.
?finitepopulation.
ANSWER:
c
93.
Whenthepopulationhasanormaldistribution,thesamplingdistributionof
isnormallydistributedforanysample
a.
size.
b.
sizeof30ormore.
c.
sizeof50ormore.
d.
fromafinitepopulation.
ANSWER:
a
94.
Thestandarderroroftheproportionwillbecomelargeras?
a.
?nincreases.
b.
?papproaches0.
c.
?papproaches.5.
d.
?papproaches1.
ANSWER:
c
95.
Allofthefollowingaretrueaboutthestandarderrorofthemeanexcept?
a.
?itislargerthanthestandarddeviationofthepopulation.
b.
?itdecreasesasthesamplesizeincreases.
c.
?itsvalueisinfluencedbythestandarddeviationofthepopulation.
d.
?itmeasuresthevariabilityinsamplemeans.
ANSWER:
a
96.
Theextentofthesamplingerrormightbeaffectedbyallofthefollowingfactorsexceptthe
a.
variabilityofthepopulation.
b.
expectedvalueofthesamplestatistic
c.
samplesize.
d.
samplingmethodused.
ANSWER:
b
97.
Thedesiredsituationiswhen
thesampledpopulationis_____
thetargetedpopulation.
a.
identicalto
b.
largerthan
c.
smallerthan
d.
morevariedthan
ANSWER:
a
98.
Itisimpossibletoconstructaframefora(n)_____
population.
a.
finite
b.
infinite
c.
target
d.
defined
ANSWER:
b
99.
Whichofthefollowingstatementsaboutclustersamplingisfalse??
a.
?Allelementswithintherandomlyselectedclustersformthesample
b.
?Itgenerallyrequiresasmallertotalsamplesizethansimplerandomsampling
c.
?Ideally,eachclusterisarepresentativesmall-scaleversionoftheentirepopulation
d.
?Itprovidesthebestresultswhentheelementswithintheclustersarenotalike
ANSWER:
b
100.
Instratifiedrandomsampling,?
a.
?randomlyselectedelementswithineachofthestrataformthesample.
b.
?allelementswithintherandomlyselectedstrataformthesample.
c.
?randomlyselectedelementswithintherandomlyselectedstrataformthesample.
d.
?allelementswithineachofthestrataformthesample.
ANSWER:
a
101.
Thebasisforusinganormalprobabilitydistributiontoapproximatethesamplingdistributionof
is?
a.
?Chebyshev’stheorem.
b.
?Theempiricalrule.
c.
?Thecentrallimittheorem.
d.
?Bayes'theorem.
ANSWER:
c
102.
Theabsolutevalueofthedifferencebetweenthepointestimateandthepopulationparameteritestimatesisthe_____
error.
a.
standard
b.
sampling
c.
efficient
d.
finite
ANSWER:
b
103.
Whichofthefollowingbestdescribestheformofthesamplingdistributionofthesampleproportion?
a.
Whenstandardized,itisexactlythestandardnormaldistribution.
b.
Whenstandardized,itisthetdistribution.
c.
Itisapproximatelynormalaslongasn30.
d.
Itisapproximatelynormalaslongasnp5andn(
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