5. What is a control group? (p.135) An experimental (treatment) group? (p.135) Why are control groups soimportant for experimental design? (book and lecture) 6. Why is equalizing subjects across experimental groups important? What two methods can we use to equalize groups in an experiment? (p.137-139) What are the advantages and disadvantages of each? 7. What is internal validity in an experiment? List and describe the nine major threats to internal validity. (p.145-150) (book and lecture) 8. What is a double-blind experiment? (p.150) Why is it necessary? (p.150)(book) 9. What is the Solomon four-group design? (p.153-154) What major threat to internal validity does it specifically address? (book and lecture) 10. Be able to define key terms for the chapter. (see Key Terms) CHAPTER 7: Survey Research 1. What is survey research? (p.163) Why are surveys so popular? List and briefly describe the three advantages of survey research. (p.163) (book and lecture) 2. What are the four types of survey errors? Be able to describe each. (lecture) 3. What are the principles of writing good questions for a survey? What errors should you avoid when writing questions? Be prepared to evaluate errors in survey questions and to write good questions. 4. Describe the strengths and weaknesses of the four major survey modes: mailed, telephone, in-personand electronic (email and Web) surveys (you can ignore group-administered surveys). (p.172-183) What is the biggest strength and the biggest weakness for each? (book, handout, and lecture) 5. What are adjusted and unadjusted response rates? What can you do to improve response rates in mail surveys and interviews? How do you estimate the impact of non-response on your survey results? (lecture) 6. How do you allow for uncertainty in questions? What are the pros and cons? Why worry about “floaters”?(p.167) “Fence-sitters”? (p.168) (book and lecture) 7. List and briefly describe the two ways question order affect survey responses. (p.171 plus Dillman)How do social desirability, acquiescence and primacy/recency affect survey responses? (Dillman p.312-316)(book and lecture) 8. Why is a questionnaire layout so important? (p.171) What four key factors should be considered in organizing a questionnaire? How can "vertical flow," "white space," and question numbering be used to improve questionnaire design? (book and lecture) 9. What is a screening question? What potential problems do you face using screening questions in mail surveys? What are skip questions? What should you consider if you must ask respondents to skip segments of the questionnaire? What skip patterns work better than others? How do color and question layout patterns affect “skip errors?” (Dillman p.169-181 and lecture)
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- Fall '08