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The directionality problem is a fundamental reason why correlation does not imply causation. It occurs when two variables, $$X$$ and $$Y$$, are statistically related, but it is impossible to determine the causal direction of the effect. Because neither variable is manipulated by the researcher, one cannot confidently identify whether $$X$$ causes $$Y$$, or if $$Y$$ causes $$X$$. For example, a statistical relationship showing that people who exercise are happier could mean that exercising causes happiness, or conversely, that happiness gives people the energy and desire to exercise.

Directionality Problem

Which of the following best defines the directionality problem in correlational research?

A study shows a strong correlation between daily mindfulness meditation and reduced stress levels. If researchers cannot determine whether meditating causes people to feel less stressed, or if naturally less-stressed people are simply more likely to engage in meditation, this ambiguity is an example of the directionality problem.

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