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Quantitative Research Design - Week 4 assignment and resource materials

Quasi-experimental designs are used to assess a causal relationship between variables. This is what primarily distinguishes this research design from descriptive and correlational designs. Quasi-experimental designs are often used in psychological research to establish cause-effect relationships among variables.

Unlike experimental designs, quasi-experimental designs are used when random assignment is not possible or practical. Quasi-experimental designs involve selecting groups, so with these groups a variable is tested without any random pre-selection processes.

Therefore, the identified control groups exposed to the treatment variable are studied and compared to groups that are not exposed to the variable. When analyses is conducted and conclusions are drawn, determining causes must be done with careful attention, as other variables, both known and unknown, can still impact the outcome.

Basic quasi-experimental designs include (a) single group post-test only designs, (b) single group pretest/posttest design, (c) single-group time-series design, (d) nonequivalent control group posttest-only design, (e) nonequivalent control group pretest/posttest design and (f) multiple-group time-series design (Jackson, 2016) Quasi-experimental designs can be developed and calculated in a more sophisticated manner than descriptive or correlation designs because they attempt to establish cause-effect relationships among the variables. Some examples of causal-correlational research or quasi-experimental design application would be to examine the effect of gender on math readiness; or the effect of youth groups on middle-school boys’ school attendance.

Be sure to review this week's resources carefully. You are expected to apply the information from these resources when you prepare your assignments

1. See PDF of Quasi-Experimental Method - In: Encyclopedia of Measurement and Statistics

2. See Chapter 6 (word document)

3. See Johnson pdf.

Assignment

For this task, you will prepare a mock interview. Assume you were asked to interview a researcher about the merits and weaknesses of quasi-experimental designs. These designs include (a) single group post-test only designs, (b) single group pretest/posttest design, (c) single-group time-series design, (d) nonequivalent control group posttest-only design, (e) nonequivalent control group pretest/posttest design and (f) multiple-group time-series design.

Your interview should be conversational in nature and critically discuss the following questions regarding each of the major Quasi-Experimental Designs:

What are the merits of each of the specific designs?

When should you use each of the specific designs?

What is the statistical analysis that is used for each of the specific designs?

What are the limitations of each of the specific designs?

What is one research question for each of the specific designs (using a topic area that you are interested in)?

For your mock interview, utlize all of this week’s required readings to illustrate points throughout your interview.

Length: 5- pages