A researcher randomly assigns one classroom to a new teaching method and a second classroom to the control condition (the regular teaching method).This researcher faces the potential problem of confounding due to

Question

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The use of intact groups (in this case, pre-existing classrooms) as opposed to randomly assigning individual participants to conditions can introduce confounding variables related to the characteristics of the groups themselves, such as differences in ability, motivation, or prior knowledge.

A Researcher Randomly Assigns One Classroom to a New Teaching