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 for forming comparable groups in a random groups design. It ensures that each participant has an equal chance of being placed in either group, making the groups more comparable. Random-digit dialing and random selection are methods used for sampling participants, but do not address the issue of forming comparable groups. Matching participants on the dependent variable is not appropriate since the dependent variable is what is being measured and compared between the groups. Matching on it would eliminate any potential differences between the groups.

The Most Common Solution to the Problem of Forming Comparable