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If we measure the amount of rainfall in a particular season and the rate of growth of the grass in a particular area and find

If we measure the amount of rainfall in a particular season and the rate of growth of the grass in a particular area and find a positive correlation of 0.83, we can say with some certainty that rain causes grass to grow. Is this true? I believe it to be because a positive correlation usually means that they variable are related and thus as one increases so does the other?

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