Describe the advantages and disadvantages of

Question

Jackson (2012), even-numbered chapter exercises, p 360.

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?

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.

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

Describe each of the following types of designs, explain its logic, and why the design does or does not address the selection threats discussed in Chapter 7 of Trochim and Donnelly (2006):

• Non-equivalent control group pretest only
• Non-equivalent control group pretest/posttest
• Cross-sectional
• Regression-Discontinuity

Why are quasi-experimental designs used more often than experimental designs?

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.

Answer 1

Answer the following questions carefully by reading all the questions and write in detailed paragraph in APA formatting. Q1. Explain the merits and demerits of quasi-experiments? Describe the fundamental weakness of the quasi-experimental design? Explain why is it a weakness? Does its weakness for all time matter? Q2. If you arbitrarily assign participants to groups, can you expect the groups are equivalent at the starting of the study? At end? Explain why or why not? If you can’t suppose equivalence at either end, what can you do? Please describe. Q3. Describe and provide illustrations of how the specific outcomes of a study can propose if a specific threat is probably to have been present. Q4. Explain why are quasi-experimental designs employed more often than the experimental designs?