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When one treatment condition has a lasting effect on individuals that influences their scores in future treatments, the study is confounded by ____.

User Hugemeow
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The answer is carry-over effects

Explanation: Carry-Over Effects is an effect that "transports" from one experimental condition to another. Whenever subjects perform in more than one condition (which occurs in projects within the subject), there is the possibility of transition effects. For example, consider an experiment on the effect of presentation rate on memory.

User Iredia Ebikade
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