Among the limitations of the correlational method, one of the more serious is that

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The correlational method can only establish a relationship between two variables, but it cannot prove that one variable causes the other. This is often referred to as the problem of causality. Even if there is a strong correlation between two variables, such as higher levels of education being associated with higher levels of income, it is possible that a third variable is causing both (e.g. intelligence). Therefore, correlational research can only suggest possible causal relationships, but further experimental research is needed to establish causality.

Among the Limitations of the Correlational Method, One of the More