If the participants in one treatment condition are noticeably older than the participants in another treatment condition, then participant age is a confounding variable.

Question

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When the age of participants is different between two treatment conditions, it can affect the results and make it difficult to determine if the dependent variable is being influenced by the independent variable or the participant's age. Therefore, age becomes a confounding variable.

If the Participants in One Treatment Condition Are Noticeably Older