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A town reports lower water consumption after introducing water-saving messages. However, unusually heavy rainfall occurred during the same period. Why should researchers consider the rainfall?

Answer and explanation

Correct answer: Rainfall may independently affect water use, making it difficult to isolate the messages' effect

Rainfall may change the need for watering gardens or other activities. When an external event occurs alongside a campaign, a before-and-after comparison alone cannot reliably separate their effects.

Related tags

Policy EvaluationExternal FactorsWater ConsumptionCausal Reasoning

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