TWELFTH EDITION PRACTICAL RESEARCH - Pearson

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330 Hudson Street, NY NY 10013PRACTICAL RESEARCHPLANNING AND DESIGNTWELFTH EDITIONPaul D. LeedyLate of American UniversityandJeanne Ellis OrmrodUniversity of Northern Colorado (Emerita)with Laura Ruth JohnsonNorthern Illinois 111/01/18 11:20 AMDirector and Publisher: Kevin M. DavisContent Producer: Janelle RogersPortfolio Management Assistant: Casey CoriellExecutive Field Marketing Manager: Krista ClarkExecutive Product Marketing Manager: Christopher BarryProcurement Specialist: Carol MelvilleDevelopment Editor: Pamela BennettCover Designer: Cenveo Publisher ServicesCover Photo: Cavan Project Management: Norine Strang, Cenveo Publisher ServicesComposition: Cenveo Publisher ServicesPrinter/Binder: LSC CommunicationsCover Printer: Phoenix ColorText Font: Garamond 3 LT ProCopyright 2019, 2016 by Pearson Education, Inc.

iv Preface Chapter 4. Addition of the concept unit of analysis as a key term; explicit distinction between the key terms assessment and measurement (to create a better balance between qualitative and quantitative strategies in this and succeeding chapters); overhaul of the eleventh edition’s section “Considering the Validity of Your Method” to give a

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