智慧树知到《商务统计》见面课答案.docx
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智慧树知到《商务统计》见面课答案
见面课：
常见的假设检验及区间估计（双总体及多总体）
1、问题:
Onerulethatmustalwaysbefollowedinconstructingfrequencydistributionsisthat__.
选项：
A:
adjacentclassesmustnotoverlap
B:
themidpointofeachclassmustbeawholenumber
C:
thewidthofeachclassisequaltotherange
D:
thenumberofintervalsmustbeanoddnumber
答案:
【adjacentclassesmustnotoverlap】
2、问题:
image.png
选项：
A:
areestablishedcorrectly
B:
arenotmutuallyexclusively
C:
arenotcollectivelyexhaustive
D:
donnotreferenceapopulationparameter
答案:
【arenotcollectivelyexhaustive】
3、问题:
Whenafalsenullhypothesisisnotrejected,theresearcherhasmadea
选项：
A:
typeIIerror.
B:
samplingerror.
C:
powerfulerror.
D:
typeIerror
答案:
【typeIIerror.】
4、问题:
image.png
选项：
A:
image.png
B:
image.png
C:
image.png
D:
image.png
答案:
【image.png】
5、问题:
Whichofthefollowingisanappropriatenullhypothesis?
选项：
A:
image.png
B:
image.png
C:
image.png
D:
image.png
答案:
【image.png】
6、问题:
Inwhattypeoftestisthevariableofinterestthedifferencebetweenthevaluesoftheobservationsratherthantheobservationsthemselves?
选项：
A:
atestfortheequalityofvariancesfrom2independentpopulations
B:
atestforthedifferencebetweenthemeansof2relatedpopulations
C:
atestforthedifferencebetweenthemeansof2independentpopulations
D:
Alloftheabove
答案:
【Alloftheabove】
7、问题:
Thetestfortheequalityoftwopopulationvariancesisbasedonthe
选项：
A:
ratioofthetwosamplevariances
B:
differencebetweenthetwosamplevariances
C:
differencebetweenthetwopopulationvariances
D:
differencebetweenthesamplevariancesdividedbythedifferencebetweenthesamplemeans
答案:
【ratioofthetwosamplevariances】
8、问题:
image.png
选项：
A:
zero.
B:
-0.5.
C:
0.5
D:
one.
答案:
【0.5】
9、问题:
image.png
选项：
A:
tdistributionwith73degreesoffreedom
B:
tdistributionwith72degreesoffreedom.
C:
tdistributionwith71degreesoffreedom
D:
tdistributionwith70degreesoffreedom.
答案:
【tdistributionwith70degreesoffreedom.】
10、问题:
image.png
选项：
A:
image.png
B:
image.png
C:
image.png
D:
image.png
答案:
【image.png】
见面课：
正确理解概率的含义及几种常见的概率统计分布
1、问题:
Giventhefollowinginformation:
Standarddeviation=8Coefficientofvariation=64%Themeanwouldthenbe
选项：
A:
12.5
B:
8
C:
0.64
D:
1.25
答案:
【12.5】
2、问题:
Fromapopulationof500elements,asampleof225elementsisselected.Itisknownthatthevarianceofthepopulationis900.Thestandarderrorofthemeanisapproximately
选项：
A:
1.1022
B:
2
C:
30
D:
1.4847
答案:
【1.4847】
3、问题:
Asampleof400observationswillbetakenfromaninfinitepopulation.Thepopulationproportionequals0.8.Theprobabilitythatthesampleproportionwillbegreaterthan0.83is
选项：
A:
0.4332
B:
0.9332
C:
0.0668
D:
0.5668
答案:
【0.0668】
4、问题:
Aweightedaverageofthevalueofarandomvariable,wheretheprobabilityfunctionprovidesweightsisknownas
选项：
A:
aprobabilityfunction
B:
arandomvariable
C:
theexpectedvalue
D:
randomfunction
答案:
【theexpectedvalue】
5、问题:
Thestudentbodyofalargeuniversityconsistsof60%femalestudents.Arandomsampleof8studentsisselected.Whatistheprobabilitythatamongthestudentsinthesampleexactlytwoarefemale?
选项：
A:
0.0896
B:
0.2936
C:
0.0413
D:
0.0007
答案:
【0.0413】
6、问题:
image.pngimage.png
选项：
A:
1.431
B:
2.047
C:
3.05
D:
21
答案:
【1.431】
7、问题:
Exhibit2Thefollowingrepresentstheprobabilitydistributionforthedailydemandofcomputersatalocalstore.image.png
选项：
A:
0.7
B:
0.3
C:
0.4
D:
1.0
答案:
【0.7】
8、问题:
IfAandBareindependentevents,then
选项：
A:
P（A）mustbeequaltoP（B）
B:
P（A）mustbegreaterthanP（B）
C:
P（A）mustbelessthanP（B）
D:
P（A）mustbeequaltoP（A│B）
答案:
【P（A）mustbeequaltoP（A│B）】
9、问题:
Thepurposeofstatisticalinferenceistoprovideinformationaboutthe
选项：
A:
samplebaseduponinformationcontainedinthepopulation
B:
populationbaseduponinformationcontainedinthesample
C:
populationbaseduponinformationcontainedinthepopulation
D:
meanofthesamplebaseduponthemeanofthepopulation
答案:
【populationbaseduponinformationcontainedinthesample】
10、问题:
Atheoremthatallowsustousethenormalprobabilitydistributiontoapproximatethesamplingdistributionofsamplemeansandsampleproportionswheneverthesamplesizeislargeisknownasthe
选项：
A:
approximationtheorem
B:
normalprobabilitytheorem
C:
centrallimittheorem
D:
centralnormalitytheorem
答案:
【centrallimittheorem】
见面课：
相关分析及回归分析
1、问题:
Iftwovariables,XandY,haveastronglinearrelationship,then
选项：
A:
TheremayormaynotbeanycausalrelationshipbetweenXandY
B:
XcausesYtohappen
C:
YcausesXtohappen
D:
Noneofthesealternativesiscorrect
答案:
【TheremayormaynotbeanycausalrelationshipbetweenXandY】
2、问题:
Inordertotestforthesignificanceofaregressionmodelinvolving14independentvariablesand255observations,thenumeratoranddenominatordegreesoffreedom（respectively）forthecriticalvalueofFare
选项：
A:
14and255
B:
255and14
C:
14and240
D:
13and240
答案:
【14and240】
3、问题:
Inamultipleregressionanalysismodelinvolving2independentvariablesand15observations,SSR=268andSST=325.Theadjustedcoefficientofdeterminationis
选项：
A:
0.90
B:
0.80
C:
0.70
D:
Notenoughinformationisprovidedtoanswerthisquestion
答案:
【0.80】
4、问题:
Whichisconsideredtobeapositivelinearrelationship
选项：
A:
xgoesup,ygoesdown
B:
xgoesdown,ygoesup
C:
xgoesdown,ygoesdown
D:
xgoesup,ygoesup
E:
bothcandd
答案:
【bothcandd】
5、问题:
Inaregressionanalysis,ifSSEishypotheticallydecreased,then
选项：
A:
R2willDecrease
B:
SewillIncrease
C:
SSTwilldecrease
D:
Bothaandb
E:
Noneoftheabove
答案:
【Noneoftheabove】
见面课：
置信区间估计和假设检验（单总体）
1、问题:
deviationisthedistancebetweena___andthe____.v
选项：
A:
median,mean
B:
datapoint,mean
C:
quartile,median
D:
datapoint,median
答案:
【datapoint,mean】
2、问题:
Thesumofthedeviationsmaybe0.00.Togetaroundthisproblem,weusethe__ofthedeviations
选项：
A:
square
B:
absolutevalue
C:
minimum
D:
maximum
答案:
【square】
3、问题:
Thereasonthatwepreferthesamplestandarddeviationasourmeasureoftypicalvariationinsteadofthesamplevarianceisthat_
选项：
A:
thevarianceisnotasaccurateameasurementasthestandarddeviation
B:
thestandarddeviationhasbeencorrectedforbiaswhilethevariancehasnot
C:
thestandarddeviationisinthesameunitsasthedatavalues.
D:
thevarianceisinthesameunitsasthedatavalues.
答案:
【thestandarddeviationisinthesameunitsasthedatavalues.】
4、问题:
Theempiricalruletellsusthatapproximatelyofthevaluesclusterwithinadistanceof1standarddeviationfromthemeanforabell-shapeddistribution
选项：
A:
68%
B:
95%
C:
99.7%
D:
noneoftheabove
答案:
【68%】
5、问题:
Xisadiscreterandomvariablethatcanhavevaluesfrom0toinfinity,andoccurrencesoftheeventsXcountsareindependent.ThestandarddeviationofXisequaltothesquarerootofthemean.TheprobabilitydistributionofXisa（n）_____distribution.
选项：
A:
binomial
B:
uniform
C:
normal
D:
Possion
答案:
【Possion】
6、问题:
Whenanalyzingcategoricaldata,stemandleafdisplayisanappropriateplot.
选项：
A:
对
B:
错
答案:
【错】
7、问题:
Ifthepopulationdistributionisunknown,inmostcasesthesamplingdistributionofthemeancanbeapproximatedbythenormaldistributionifthesamplesizeisatleast15observations
选项：
A:
对
B:
错
答案:
【错】
8、问题:
Statisticalindependencemeanstheoutcomeofoneeventisindependentoftheoutcomeofasecondevent
选项：
A:
对
B:
错
答案:
【对】
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