智慧树知到《商务统计》见面课答案.docx

智慧树知到《商务统计》见面课答案.docx

《智慧树知到《商务统计》见面课答案.docx》由会员分享，可在线阅读，更多相关《智慧树知到《商务统计》见面课答案.docx（11页珍藏版）》请在冰豆网上搜索。

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】