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Experimental Research Design Answers to Study Questions 9.1 What is a research design and what is its purpose? Describe the research designs with . . . 9.2 What are the criteria that need to What function is served by the control . . . 9.4 Why would you want to pretest . . . 9.5 Diagram a posttest-only research . . . Explain why a simple randomized design 9.6 What is a factorial design and why What are main and interaction effects . . . Describe an interaction between . . . What are the advantages and . . . 9.7 Describe a within-participants . . . Describe a factorial design based on a . . . List the advantages and disadvantages . . . 9.8 Describe the pretest-posttest . . . Copyright © 1995-2008, Pearson Education, Inc., publishing as Pearson Allyn & Bacon Legal and Privacy Terms