Your response should reflect scholarly writing
and current APA standards with references where appropriate.

Even Numbered Chapter Exercises

2. A
psychology professor is interested in weather implementing weekly quizzes
improves student learning. She decided
to use the weekly quizzes in one section of her introductory psychology class
and not to use them in another section of the same course. Which type of quasi-experimental design do
you recommend for this study?

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Identify some possible confounds in each of the studies you outlined in your
answer to question 2 above.

Give three reason a researcher might chose to use a single case design?

How does a multiple base line design differ from a reversal design?


2. Describe the advantages and disadvantages
of quasi-experiments? What is the fundamental weakness of a quasi-experimental
design? Why is it a weakness? Does its weakness always matter?

3. If you randomly assign participants
to groups, can you assume the groups are equivalent at the beginning of the
study? At the end? Why or why not? If you cannot assume equivalence at either
end, what can you do? Please explain.

4. Explain and give examples of how the particular outcomes of a study can
suggest if a particular threat is likely to have been present.

5. Describe the following
designs and the threats they don’t address.

a. Non-equivalent control
group pretest only

b. Non-equivalent control
group pretest/posttest

c. Cross-sectional

d. Regression-Discontinuity

6. Why are quasi-experimental designs used more often than experimental

7. One conclusion you might reach (hint) after completing the readings for this
assignment is that there are no bad designs, only bad design choices (and
implementations). State a research question for which a single-group post-test
only design can yield relatively unambiguous findings.

1. What research
question(s) does the study address?

2. What is Goldberg’s rationale for the study? Was the study designed to
contribute to theory? Do the results of the study contribute to theory? For
both questions: If so, how? If not, why not?

3. What constructs does the study address? How are they operationalized?

4. What are the independent
and dependent variables in the study?

5. Name the type of design the researchers used.

6. What internal and external validity threats did the researchers address in
their design? How did they address them? Are there threats they did not
address? If so how does the failure to address the threats affect the
researchers, interpretations of their findings? Are Goldberg’s conclusions
convincing? Why or why not?


Creswell, J. W. (2013). Research
design: Qualitative, quantitative, and mixed methods approaches.

4th ed. Thousand Oaks, CA Sage Publications

Jackson, S. L. (2012). Research methods and statistics: A
critical thinking approach. 
CA. Wadsworth Cengage Learning.

W. & Donnelly, J. P. (2008). The
research methods knowledge base. 
OH Thomson Custom.

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