A research study funded by Wobegon Springs Mineral Water, Inc., discovers that the probability that a newborn

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A research study funded by Wobegon Springs Mineral Water, Inc., discovers that the probability that a newborn child has a birth defect is lower for families that regularly buy bottled water than for families that do not.

Does this association reflect a causal link between drinking bottled water and a reduction in birth defects?Why or why not?

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