Statistics for Managers Using Microsoft Excel 7E - Levine - SM levine_smume7_ism_09

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1、SolutionstoEnd-of-SectionandChapterReviewProblems345CHAPTER99.1Decisionrule:RejectH0ifZSTAT<–1.96orZSTAT>+1.96.Decision:SinceZSTAT=-0.76isinbetweenthetwocriticalvalues,donotrejectH0.9.2Decisionrule:RejectH0ifZSTAT<–1.96orZSTAT>+1.96.Decision:SinceZSTAT=+2.21isgreaterthantheuppercr

2、iticalvalueof+1.96,rejectH0.9.3Decisionrule:RejectH0ifZSTAT<–1.645orZSTAT>+1.645.9.4Decisionrule:RejectH0ifZSTAT<–2.58orZSTAT>+2.58.9.5Decision:SinceZSTAT=–2.61islessthanthelowercriticalvalueof–2.58,rejectH0.9.6p-value=2(1-.9772)=0.04569.7Sincethep-valueof0.0456islessthanthe0.10le

3、velofsignificance,thestatisticaldecisionistorejectthenullhypothesis.9.8p-value=0.16769.9istheprobabilityofincorrectlyconvictingthedefendantwhenheisinnocent.istheprobabilityofincorrectlyfailingtoconvictthedefendantwhenheisguilty.9.10UndertheFrenchjudicialsystem,unlikeoursintheUnite

4、dStates,thenullhypothesisassumesthedefendantisguilty,thealternativehypothesisassumesthedefendantisinnocent.ATypeIerrorwouldbenotconvictingaguiltypersonandaTypeIIerrorwouldbeconvictinganinnocentperson.9.11(a)ATypeIerroristhemistakeofapprovinganunsafedrug.ATypeIIerrorisnotapprovinga

5、safedrug.(b)TheconsumergroupsaretryingtoavoidaTypeIerror.(c)TheindustrylobbyistsaretryingtoavoidaTypeIIerror.(d)TolowerbothTypeIandTypeIIerrors,theFDAcanrequiremoreinformationandevidenceintheformofmorerigoroustesting.Thiscaneasilytranslateintolongertimetoapproveanewdrug.9.12H0:=20

6、minutes.20minutesisadequatetraveltimebetweenclasses.H1:20minutes.20minutesisnotadequatetraveltimebetweenclasses.9.13(a)H0:=12.1hoursH1:12.1hours(b)ATypeIerroristhemistakeofconcludingthatthemeannumberofhoursstudiedbymarketingmajorsatyourschoolisdifferentfromthe12.1-hour-per-weekben

7、chmarkreportedbyTheWashingtonPostwheninfactitisnotanydifferent.Copyright©2014PearsonEducation,Inc.SolutionstoEnd-of-SectionandChapterReviewProblems3459.13(c)ATypeIIerroristhemistakeofnotconcludingthemeannumberofhoursstudiedbycont.marketingmajorsatyourschoolisdifferentfromthe12.1-h

8、our-per-weekbenchmarkreportedbyTh