Psy141 Chapter 12 A Quasi-Experimental Research Strategies Example A researcher

Question

Psy141 Chapter 12 A Quasi-Experimental Research Strategies Example A researcher introduced a new mathematics program in one school district and used a neighboring district as a no-treatment control group. Before and after the six-month program, the researcher gave the students in both districts a standardized mathematics test and then compared their scores. The students in the new program performed significantly better on the test than those in the control group. 1. This research cannot be classified as a true experiment because 2. What type of quasi-experimental design was used in this study? Can the researchers conclude that the program they implemented caused the differences in the test results? Why or why not? 3. 4. What could be some alternative explanations of the results reported by the researchers? 5. What are the sources of bias in this study? How could the design (as a quasi-experimental design) be improved to avoid the sources of bias? 6. 7. How could the design be changed to create an experiment?

Explanation / Answer

1. This research cannot be classified as a true experiment because there is no random assignment of participants into the experimental and control group.

2. The between-groups study design was used in this research.

3. Although claims of causality in quasi-experiments are not as strong as in the case of true experiments, the researchers of the study can still establish causal links between the variables. This is because they can clearly identify the impact of the independent variable by keeping all other variables controlled.

4. Another explanation for the results could be that students in the experimental group belonged to a school that promoted better instructional methods.

Please post the other questions separately as we are supposed to answer just one question or four sub parts of a question.

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