《商务统计》见面课之答案Word文档下载推荐.docx
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《商务统计》见面课之答案Word文档下载推荐.docx
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thenumberofintervalsmustbeanoddnumber
答案:
【adjacentclassesmustnotoverlap】
2、问题:
image.png
areestablishedcorrectly
arenotmutuallyexclusively
arenotcollectivelyexhaustive
donnotreferenceapopulationparameter
【arenotcollectivelyexhaustive】
3、问题:
Whenafalsenullhypothesisisnotrejected,theresearcherhasmadea
typeIIerror.
samplingerror.
powerfulerror.
typeIerror
【typeIIerror.】
4、问题:
【image.png】
5、问题:
Whichofthefollowingisanappropriatenullhypothesis?
6、问题:
Inwhattypeoftestisthevariableofinterestthedifferencebetweenthevaluesoftheobservationsratherthantheobservationsthemselves?
atestfortheequalityofvariancesfrom2independentpopulations
atestforthedifferencebetweenthemeansof2relatedpopulations
atestforthedifferencebetweenthemeansof2independentpopulations
Alloftheabove
【Alloftheabove】
7、问题:
Thetestfortheequalityoftwopopulationvariancesisbasedonthe
ratioofthetwosamplevariances
differencebetweenthetwosamplevariances
differencebetweenthetwopopulationvariances
differencebetweenthesamplevariancesdividedbythedifferencebetweenthesamplemeans
【ratioofthetwosamplevariances】
8、问题:
zero.
-0.5.
0.5
one.
【0.5】
9、问题:
tdistributionwith73degreesoffreedom
tdistributionwith72degreesoffreedom.
tdistributionwith71degreesoffreedom
tdistributionwith70degreesoffreedom.
【tdistributionwith70degreesoffreedom.】
10、问题:
正确理解概率的含义及几种常见的概率统计分布
Giventhefollowinginformation:
Standarddeviation=8Coefficientofvariation=64%Themeanwouldthenbe
12.5
8
0.64
1.25
【12.5】
Fromapopulationof500elements,asampleof225elementsisselected.Itisknownthatthevarianceofthepopulationis900.Thestandarderrorofthemeanisapproximately
1.1022
2
30
1.4847
【1.4847】
Asampleof400observationswillbetakenfromaninfinitepopulation.Thepopulationproportionequals0.8.Theprobabilitythatthesampleproportionwillbegreaterthan0.83is
0.4332
0.9332
0.0668
0.5668
【0.0668】
Aweightedaverageofthevalueofarandomvariable,wheretheprobabilityfunctionprovidesweightsisknownas
aprobabilityfunction
arandomvariable
theexpectedvalue
randomfunction
【theexpectedvalue】
Thestudentbodyofalargeuniversityconsistsof60%femalestudents.Arandomsampleof8studentsisselected.Whatistheprobabilitythatamongthestudentsinthesampleexactlytwoarefemale?
0.0896
0.2936
0.0413
0.0007
【0.0413】
image.pngimage.png
1.431
2.047
3.05
21
【1.431】
Exhibit2Thefollowingrepresentstheprobabilitydistributionforthedailydemandofcomputersatalocalstore.image.png
0.7
0.3
0.4
1.0
【0.7】
IfAandBareindependentevents,then
P(A)mustbeequaltoP(B)
P(A)mustbegreaterthanP(B)
P(A)mustbelessthanP(B)
P(A)mustbeequaltoP(A│B)
【P(A)mustbeequaltoP(A│B)】
Thepurposeofstatisticalinferenceistoprovideinformationaboutthe
samplebaseduponinformationcontainedinthepopulation
populationbaseduponinformationcontainedinthesample
populationbaseduponinformationcontainedinthepopulation
meanofthesamplebaseduponthemeanofthepopulation
【populationbaseduponinformationcontainedinthesample】
Atheoremthatallowsustousethenormalprobabilitydistributiontoapproximatethesamplingdistributionofsamplemeansandsampleproportionswheneverthesamplesizeislargeisknownasthe
approximationtheorem
normalprobabilitytheorem
centrallimittheorem
centralnormalitytheorem
【centrallimittheorem】
相关分析及回归分析
Iftwovariables,XandY,haveastronglinearrelationship,then
TheremayormaynotbeanycausalrelationshipbetweenXandY
XcausesYtohappen
YcausesXtohappen
Noneofthesealternativesiscorrect
【TheremayormaynotbeanycausalrelationshipbetweenXandY】
Inordertotestforthesignificanceofaregressionmodelinvolving14independentvariablesand255observati
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