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Define strict random assignment and modified random assignment based on the provided text. Why do researchers frequently choose to use a modified random assignment approach instead of a strict procedure like coin flipping?
Question: Define strict random assignment and modified random assignment based on the provided text. Why do researchers frequently choose to use a modified random assignment approach instead of a strict procedure like coin flipping?
Sample answer: Strict random assignment procedures, such as flipping a coin, assign participants to conditions purely by chance, which often results in unequal group sizes. Modified random assignment is a structured approach designed to keep the number of individuals in each experimental condition as similar as possible. Researchers frequently use modified random assignment because, for a given number of participants, it is statistically more efficient to have groups of the same size.
Key points:
- Strict random assignment (like coin flipping) often leads to unequal sample sizes.
- Modified random assignment intentionally structures the process to keep group sizes as similar as possible.
- Researchers use modified random assignment because equal-sized groups are statistically more efficient for a fixed number of participants.
Rubric: A correct response must define strict random assignment as a process (like coin flipping) that often yields unequal groups, and modified random assignment as an approach that structures the process to keep group sizes similar. It must also state that researchers use it because equal-sized groups are statistically more efficient.
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Research Methods in Psychology - 4th American Edition @ KPU
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