While watching a railroad crossing, you observe that a crossing barrier is lowered about (30 mathrm{~s}) before
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While watching a railroad crossing, you observe that a crossing barrier is lowered about \(30 \mathrm{~s}\) before a train passes. This happens every time for a long while, until suddenly after many times the barrier is not lowered but a train passes anyway! Discuss the causal relationship between the passing of a train and the lowering of the barrier. Does the single unusual occurrence make a difference to your answer?
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