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In a recent study, researchers concluded that exercise significantly lowered stress levels. What the researchers were unaware of, however, was that several of the participants

In a recent study, researchers concluded that exercise significantly lowered stress levels. What the researchers were unaware of, however, was that several of the participants in the exercise group were also taking anti-anxiety medications. The researchers' conclusion is a(n) _____ error.

Type 1 or Type 2?

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