coverageisasectiononevidence-basedpracticeand
theutilityofmeta-analysesandeffect-sizestatistics.
Asectionontheutilityofpreexperimentaldesigns
inprogramevaluationthatappearslaterinthe
chapterreturnstothosetwoconceptstoshow
howtheycanenhancethevalueofpreexperimental
designs.Thatlatersectionalsodiscusseswhypreex-
perimentaldesignsarecommonlyusedinprogram
evaluationandwhytheirlimitationsarelessprob-
lematicinaprogramevaluationcontext.Another
significantadditionisasectiononlogicmodels.
Inthequantitativedataanalysischapterwe
expandedthecoverageofeffectsizestoinclude
oddsratiosandriskratiosalongwithCohen’sd.
Wealsoaddedafiguretoillustratehowdistribu-
tionswithdifferentdegreesofdispersioncanhave
thesamecentraltendencyandhowreportsof
descriptivefindingsthatrelyexclusivelyoncentral
tendencycanbeincompleteandpossiblymislead-
ing.Alsoregardingeffectsizes,anewAppendix
(E)hasbeenaddedthatdiscussesanovelapproach
beingadvancedbyoneofus(Rubin)forcalculating
withingroupeffectsizeswhichmightenhancethe
valueofpreexperimentaldesignsinprogramevalu-
ationandreducethegapbetweenresearchand
practiceinawaythataimstoadvanceevidence-
basedpracticetoanewlevel.
Wehopeyou’llfindthattheaboveadditionsand
modificationshaveimprovedtheusefulnessof
thisbook.Wewouldliketoknowwhatyou
thinkofthiseditionandtoreceiveanysuggestions
youmighthaveforimprovingit.Pleasee-mailusat
[email protected].
ANCILLARYPACKAGE
BookCompanionWebsite
Forstudents,theBookCompanionWebsiteat
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Instructor’sManual
Also,aswithourothertext,anInstructor’sManual
mirrorstheorganizationofthistext,offeringour
recommendedteachingmethods.Eachchapterof
theonlinemanualprovidesanoutlineofrelevant
discussion,behavioralobjectives,teachingsugges-
tionsandresources,andtestitems.ThisInstructor’s
Manualissetuptoallowinstructorsthefreedom
andflexibilityneededtoteachresearchmethods
courses.
Thetestquestionsforeachchapterinclude
multiple-choiceandtrue–falseitemsandseveral
essayquestionsthatmaybeusedforexamsorto
stimulateclassdiscussion.Pagereferencestothe
textaregivenforthemultiple-choiceandtrue–
falsequestions.
ACKNOWLEDGMENTS
Weowespecialthankstothefollowingcolleagues
whoreviewedanearlierdraftofthistextandmade
valuablesuggestionsforimprovingit:MaryBeth
Hyatt,LimestoneCollege;ChrisLloyd,University
ofArkansasatLittleRock;PaulLanier,UNC
ChapelHill;JeannineRowe,Universityof
Wisconsin-Whitewater;YongLi,SUNYPlatts-
burgh;StephanieWarren,LimestoneCollege;Min
Zhan,UniversityofIllinoisatUrbana-Champaign.
Thanksalsotothefollowingstaffmembersat
CengageLearningfortheirhelpinimprovingthis
newedition:GordonLee,ProductManager;Ste-
phenLagos,ProductAssistant;RuthSakataCorley,
ProductionManager;DeannaEttinger,IPAnalyst;
KristinaMose-Libon,ArtDirector;BrendaGinty,
ManagingEditor,Production;JohnChell,Media
Editor;andJudyInoue,ManufacturingPlanner
AllenRubin
EarlBabbie
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