大学课件-商务与经济统计习题答案（第8版，中文版）SBE8-SM09.doc

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1、HypothesisTestingChapter9HypothesisTestingLearningObjectives1.Learnhowtoformulateandtesthypothesesaboutapopulationmeanand/orapopulationproportion.2.Understandthetypesoferrorspossiblewhenconductingahypothesistest.3.Beabletodeterminetheprobabilityofmakingvariouserrorsinhypothesistests.4.Knowho

2、wtocomputeandinterpretp-values.5.Beabletodeterminethesizeofasimplerandomsamplenecessarytokeeptheprobabilityofhypothesistestingerrorswithinacceptablelimits.6.Knowthedefinitionofthefollowingterms:nullhypothesisone-tailedtestalternativehypothesistwo-tailedtesttypeIerrorp-valuetypeIIerroroperati

3、ngcharacteristiccurvecriticalvaluepowercurvelevelofsignificance9-29HypothesisTestingSolutions:1.a.H0:m£600Manager’sclaim.Ha:m>600b.Wearenotabletoconcludethatthemanager’sclaimiswrong.c.Themanager’sclaimcanberejected.Wecanconcludethatm>400.2.a.H0:m£14Ha:m>14Researchhypothesisb.Thereisnostatist

4、icalevidencethatthenewbonusplanincreasessalesvolume.c.Theresearchhypothesisthatm>14issupported.Wecanconcludethatthenewbonusplanincreasesthemeansalesvolume.3.a.H0:m=32SpecifiedfillingweightHa:m¹32Overfillingorunderfillingexistsb.Thereisnoevidencethattheproductionlineisnotoperatingproperly.All

5、owtheproductionprocesstocontinue.c.Concludem¹32andthatoverfillingorunderfillingexists.Shutdownandadjusttheproductionline.4.a.H0:m³220Ha:m<220Researchhypothesistoseeifmeancostislessthan$220.b.Weareunabletoconcludethatthenewmethodreducescosts.c.Concludem<220.Considerimplementingthenewmethodbas

6、edontheconclusionthatitlowersthemeancostperhour.5.a.TheTypeIerrorisrejectingH0whenitistrue.Inthiscase,thiserroroccursiftheresearcherconcludesthatthemeannewspaper-readingtimeforindividualsinmanagementpositionsisgreaterthanthenationalaverageof8.6minuteswheninfactitisnot.b.TheTypeIIerrorisaccep

7、tingH0whenitisfalse.Inthiscase,thiserroroccursiftheresearcherconcludesthatthemeannewspaper-readingtimeforindividualsinmanagementpositionsislessthanorequaltothenationalaverageof8.6minuteswheninfactitisgreaterthan8.6minutes.6.a.H0:m£1Thelabelclaimora