Which of the following sentences best describes mediation?
A. Mediation refers to a situation in which the relationship between a predictor variable and an outcome can be explained by their relationship to a third variable.
B. Mediation refers to the combined effect of two variables on an outcome.
C. Mediation refers to a situation in which the relationship between a predictor variable and an outcome is significant only when the mediator is included in the model.
D. Mediation refers to a situation in which the relationship between a predictor variable and an outcome is unaffected by their relationship to a third variable.
Answer: A
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