The most common solution to the problem of forming comparable groups in the random groups design is

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Random assignment is the most common solution to the problem of forming comparable groups in the random groups design. With random assignment, participants are randomly assigned to either the experimental or control group, ensuring that there are no systematic differences between the groups before the intervention. This method helps to control for extraneous variables that may affect the outcome, making it possible to attribute any observed differences in the post-test to the intervention itself. Random-digit dialing and random selection are methods used to obtain a random sample for research, but they are not specific to forming comparable groups in an experiment. Matching participants on the dependent variable task may introduce bias and confound the results, as participants who are matched on a specific characteristic may also share other underlying characteristics that affect the outcome. Therefore, random assignment is the best choice for forming comparable groups in the random groups design.

The Most Common Solution to the Problem of Forming Comparable