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Define what a multiple-item measure is in psychological research, and describe the two primary methodological advantages of using this approach over a single-item measure.
Question: Define what a multiple-item measure is in psychological research, and describe the two primary methodological advantages of using this approach over a single-item measure.
Sample answer: A multiple-item measure assesses a psychological construct by aggregating participant responses across several related questions or tasks, rather than using just one data point. The two primary advantages are improved content validity and increased reliability. It improves content validity by comprehensively covering the different facets of a complex construct. It increases reliability because when multiple responses are summed or averaged, the effects of irrelevant factors, such as misinterpreting a question or making a minor error, tend to cancel each other out.
Key points:
- Defines a multiple-item measure as aggregating responses across several related questions or tasks.
- Identifies improved content validity as a primary advantage.
- Explains that multiple items comprehensively cover the various facets of a construct.
- Identifies increased reliability as a primary advantage.
- Explains that summing or averaging responses allows irrelevant factors and minor errors to cancel each other out.
Rubric: The student must define a multiple-item measure as an aggregation of responses across several questions/tasks, identify content validity as the first advantage (covering multiple facets), and identify reliability as the second advantage (canceling out irrelevant factors/errors).
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Research Methods in Psychology - 4th American Edition @ KPU
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