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2. What is the definition of a confounder? (a)A third variable that influences both exposure and treatment (b)The treatment effect is different for different levels

2. What is the definition of a "confounder"? (a)A third variable that influences both exposure and treatment (b)The treatment effect is different for different levels of the confounder (c)The treatment effect cannot be separated from a confounder due to correlation.

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