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Example of a Matched-Groups Design
To illustrate a matched-groups design, consider a study testing the effect of expressive writing on physical health. Researchers first measure baseline health variables to rank-order all participants from healthiest to least healthy. Then, taking the two healthiest individuals, they randomly assign one to the traumatic writing condition and the other to the neutral writing condition. They repeat this paired random assignment for the next two healthiest participants, continuing down the list. This process guarantees that the two groups have equivalent average health before the writing manipulation begins.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of a Matched-Groups Design
Arrange the steps involved in executing a matched-groups design in the correct order.
A researcher investigating the effect of a new memory-enhancing supplement decides to use a matched-groups design by pairing participants with similar baseline memory scores before randomly assigning one person from each pair to the supplement group and the other to the placebo group. What is the primary purpose of using this design instead of simple random assignment?
A psychology researcher is investigating the effect of a new 'Focus Training' program. To ensure that baseline differences in concentration do not confound the results, they implement a matched-groups design. Match each of the researcher's specific actions to the goal it fulfills within this experimental design.
In a matched-groups design where participants are paired based on their 'baseline anxiety levels,' the resulting groups are guaranteed to be equivalent regarding their anxiety, but they are not guaranteed to be equivalent regarding other factors like 'intelligence' or 'motivation.'
Which between-subjects experimental design requires researchers to first measure participants on a specific variable, rank-order them based on their scores, and then randomly assign the most closely matched individuals to the different treatment groups?
In a matched-groups design, because participants are paired based on their similarity on a key variable, the researcher systematically assigns one member of each pair to the experimental group and the other to the control group, completely eliminating the need for random assignment.
In a methodological critique of an experiment with a very small sample size, a researcher concludes that simple random assignment was an inadequate choice for controlling a highly influential extraneous variable. To justify a more rigorous approach, the researcher would evaluate a(n) _____ design as the most appropriate substitute for ensuring that the groups are equivalent on that specific variable from the outset.
An educational psychologist is comparing two different reading programs. To control for prior reading ability, they implement a matched-groups design. Match each phase of their methodology to its corresponding description or function in this design.
A researcher decides to use a matched-groups design to control for baseline intelligence in a study on problem-solving. By rank-ordering participants on this baseline measure and randomly assigning matched pairs, they guarantee that the groups are equivalent on intelligence at the start of the study, preventing it from becoming a _____ variable.
Evaluate the chronological methodology required to implement a matched-groups design. Arrange the steps a researcher must take, from the initial setup to the final group placement, to ensure group equivalence on a targeted variable.
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A researcher wants to test whether expressive writing about traumatic events improves physical health using a matched-groups design. Arrange the following steps in the correct order.
In a study testing the effect of expressive writing on physical health, researchers first rank-order participants by their baseline health and then randomly assign individuals from each pair to different groups. What is the primary logic behind this procedure?
Researchers are testing the effect of expressive writing on health using a matched-groups design. Match each core procedural step of the design with the correct description of its application in this study.
In the expressive writing study example, the researcher's choice to use a matched-groups design is methodologically justified as a way to prioritize internal validity by guaranteeing equivalent average health across groups, rather than relying on the chance distribution of simple random assignment.
In the expressive writing study example, after researchers measure baseline health and rank-order the participants, which individuals are placed into a pair for random assignment?
In the expressive writing study example, the researchers pair the two healthiest participants together to ensure that they are both assigned to the traumatic writing group.
In the expressive writing study example, if the researcher rank-orders and pairs participants by health but then assigns the healthier individual from every pair to the same condition instead of using _____ assignment, the groups will not be equivalent on average physical health.
In the expressive writing matched-groups study, match each methodological term to its specific application in this study.
In the expressive writing matched-groups study, baseline health is chosen as the pairing variable because it is likely to influence participants' health outcomes at the end of the study. If a researcher instead paired participants on a variable unrelated to health—such as shoe size—the matched-groups procedure would fail to reduce between-group _____ on the variable most capable of confounding the results, undermining the key advantage of the design over simple random assignment.
A researcher is drafting the justification for using a matched-groups design in the expressive writing study. Arrange the following logical arguments in the order they should appear, from foundational premise (1) to final conclusion (5).