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Based on this scenario, explain how the psychologist's expectations manifested as the experimenter expectancy effect. How does this impact the interpretation of the test scores and the overall validity of the study?
Case context: A psychologist is testing a new cognitive training program designed to improve memory retention. The psychologist, who designed the program and strongly believes in its efficacy, personally administers the memory test to the participants. While testing the experimental group, the psychologist is highly encouraging and patiently waits for their responses, but while testing the control group, the psychologist is more businesslike and moves through the questions quickly. The experimental group ends up scoring significantly higher.
Question: Based on this scenario, explain how the psychologist's expectations manifested as the experimenter expectancy effect. How does this impact the interpretation of the test scores and the overall validity of the study?
Sample answer: The psychologist's strong belief in the program's efficacy led them to subtly and inadvertently treat the two groups differently during the administration of the memory test. By being more encouraging and patient with the experimental group, they systematically altered the participants' behaviors in unintended ways. This compromises the study's validity because the higher memory test scores may be a result of the researcher's encouraging behavior rather than the cognitive training program itself.
Key points:
- Researcher expectations lead to unintended differences in behavior during administration
- Systematic alteration of participant responses due to researcher behavior
- Compromise of the study's validity
- Introduction of researcher bias as a confounding factor instead of the independent variable
Rubric: Grading Rubric: - 3 points: Explains how the researcher's expectations led to unintended behavioral differences (encouragement vs. businesslike manner) during the test administration. - 4 points: Explains how these differences systematically altered the participants' responses. - 3 points: Articulates that this compromises the study's validity by introducing an alternative explanation for the scores.
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Research Methods in Psychology - 4th American Edition @ KPU
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