JWDD073-pre October4,2007 17:27 CharCount=0 Models for Probability and Statistical Inference Theory and Applications JAMESH.STAPLETON MichiganStateUniversity DepartmentofStatisticsandProbability EastLansing,Michigan iii JWDD073-pre October4,2007 17:27 CharCount=0 vi JWDD073-pre October4,2007 17:27 CharCount=0 Models for Probability and Statistical Inference i JWDD073-pre October4,2007 17:27 CharCount=0 ii JWDD073-pre October4,2007 17:27 CharCount=0 Models for Probability and Statistical Inference Theory and Applications JAMESH.STAPLETON MichiganStateUniversity DepartmentofStatisticsandProbability EastLansing,Michigan iii JWDD073-pre October4,2007 17:27 CharCount=0 Copyright(cid:2)C 2008byJohnWiley&Sons,Inc.Allrightsreserved. PublishedbyJohnWiley&Sons,Inc.,Hoboken,NewJersey. PublishedsimultaneouslyinCanada. Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformor byanymeans,electronic,mechanical,photocopying,recording,scanning,orotherwise,exceptas permittedunderSection107or108ofthe1976UnitedStatesCopyrightAct,withouteithertheprior writtenpermissionofthePublisher,orauthorizationthroughpaymentoftheappropriateper-copyfeeto theCopyrightClearanceCenter,Inc.,222RosewoodDrive,Danvers,MA01923,(978)750-8400,fax (978)750-4470,oronthewebatwww.copyright.com.RequeststothePublisherforpermissionshould beaddressedtothePermissionsDepartment,JohnWiley&Sons,Inc.,111RiverStreet,Hoboken, NJ07030,(201)748-6011,fax(201)748-6008,oronlineathttp://www.wiley.com/go/permission. LimitofLiability/DisclaimerofWarranty:Whilethepublisherandauthorhaveusedtheirbest effortsinpreparingthisbook,theymakenorepresentationsorwarrantieswithrespecttotheaccuracy orcompletenessofthecontentsofthisbookandspecificallydisclaimanyimpliedwarrantiesof merchantabilityorfitnessforaparticularpurpose.Nowarrantymaybecreatedorextendedbysales representativesorwrittensalesmaterials.Theadviceandstrategiescontainedhereinmaynotbesuitable foryoursituation.Youshouldconsultwithaprofessionalwhereappropriate.Neitherthepublishernor authorshallbeliableforanylossofprofitoranyothercommercialdamages,includingbutnotlimitedto special,incidental,consequential,orotherdamages. Forgeneralinformationonourotherproductsandservicesorfortechnicalsupport,pleasecontactour CustomerCareDepartmentwithintheUnitedStatesat(800)762-2974,outsidetheUnitedStatesat (317)572-3993orfax(317)572-4002. Wileyalsopublishesitsbooksinavarietyofelectronicformats.Somecontentthatappearsinprintmay notbeavailableinelectronicformats.FormoreinformationaboutWileyproducts,visitourwebsiteat www.wiley.com. WileyBicentennialLogo:RichardJ.Pacifico LibraryofCongressCataloging-in-PublicationData: Stapleton,JamesH.,1931– Modelsforprobabilityandstatisticalinference:theoryandapplications/JamesH.Stapleton. p.cm. ISBN978-0-470-07372-8(cloth) 1.Probabilities—Mathematicalmodels. 2.Probabilities—Industrialapplications. I.Title. QA273.S74152008 519.2—dc22 2007013726 PrintedintheUnitedStatesofAmerica 10 9 8 7 6 5 4 3 2 1 iv JWDD073-pre October4,2007 17:27 CharCount=0 ToAlicia,whohasmademyfirsthomesopleasant foralmost44years. ToMichiganStateUniversityanditsDepartmentofStatistics andProbability,mysecondhomeforalmost49years, towhichIwillalwaysbegrateful. v JWDD073-pre October4,2007 17:27 CharCount=0 vi JWDD073-pre October4,2007 17:27 CharCount=0 Contents Preface xi 1. DiscreteProbabilityModels 1 1.1. Introduction, 1 1.2. SampleSpaces,Events,andProbabilityMeasures, 2 1.3. ConditionalProbabilityandIndependence, 15 1.4. RandomVariables, 27 1.5. Expectation, 37 1.6. TheVariance, 47 1.7. CovarianceandCorrelation, 55 2. SpecialDiscreteDistributions 62 2.1. Introduction, 62 2.2. TheBinomialDistribution, 62 2.3. TheHypergeometricDistribution, 65 2.4. TheGeometricandNegativeBinomialDistributions, 68 2.5. ThePoissonDistribution, 72 3. ContinuousRandomVariables 80 3.1. Introduction, 80 3.2. ContinuousRandomVariables, 80 3.3. ExpectedValuesandVariancesforContinuousRandomVariables, 88 3.4. TransformationsofRandomVariables, 93 3.5. JointDensities, 97 3.6. DistributionsofFunctionsofContinuousRandomVariables, 104 vii