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1、SolutionstoEnd-of-SectionandChapterReviewProblems595CHAPTER1414.1(a)HoldingconstanttheeffectofX2,foreachincreaseofoneunitinX1,theresponsevariableYisestimatedtoincreaseameanof5units.HoldingconstanttheeffectofX1,foreachincreaseofoneunitinX2,theresponsevariableY
2、isestimatedtoincreaseanaverageof3units.(b)TheY-intercept10istheestimateofthemeanvalueofYifX1andX2areboth0.14.2(a)HoldingconstanttheeffectofX2,foreachincreaseofoneunitinX1,theresponsevariableYisestimatedtodecreaseanaverageof2units.HoldingconstanttheeffectofX1,
3、foreachincreaseofoneunitinX2,theresponsevariableYisestimatedtoincreaseanaverageof7units.(b)TheY-intercept50istheestimateofthemeanvalueofYifX1andX2areboth0.14.3(a)(b)Foragivenmeasurementofthechangeinimpactpropertiesovertime,eachincreaseofoneunitinforefootimpac
4、tabsorbingcapabilityisestimatedtoresultinameanincreaseinthelong-termabilitytoabsorbshockof0.79116units.Foragivenforefootimpactabsorbingcapability,eachincreaseofoneunitinmeasurementofthechangeinimpactpropertiesovertimeisestimatedtoresultinameanincreaseinthelon
5、g-termabilitytoabsorbshockof0.60484units.14.4(a)(b)Foragivennumberoforders,eachincreaseof$1,000insalesisestimatedtoresultinameanincreaseindistributioncostof$47.114.Foragivenamountofsales,eachincreaseofoneorderisestimatedtoresultinameanincreaseindistributionco
6、stof$11.95.(c)Theinterpretationofb0hasnopracticalmeaningherebecauseitwouldhavebeentheestimatedmeandistributioncostwhentherewerenosalesandnoorders.(d)or$69,878(e)(f)(g)Sincethereismuchmorevariationinpredictinganindividualvaluethaninestimatingameanvalue,apredic
7、tionintervaliswiderthanaconfidenceintervalestimateholdingeverythingelsefixed.Copyright©2014PearsonEducation,Inc.SolutionstoEnd-of-SectionandChapterReviewProblems59514.5(a)PHStatoutput:(b)Foragivenweight,eachincreaseofoneunitinhorsepowerisestimatedtoresultinam
8、eandecreaseinMPGof0.004.Foragivenhorsepower,eachincreaseofoneunitinweightisestimatedtoresultinthemeandecreaseinMPGof0.0068.(c)Theinterpretationofb0hasnopracticalmeaningherebecauseitwouldh
