AresearchstudyfundedbyWobegonSpringsMineralWater,Inc.,discoversthatchil- dren withdentalproblemsarelesscommoninfamiliesthatregularlybuybottledwater than infamiliesthatdonot.Explainwhythisassociationneednotreflectacausal link betweendrinkingbottledwaterandhavingfewerdentalproblems.Identifylurking variablesthatcouldberesponsiblefortheresult,andexplainhow.

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AresearchstudyfundedbyWobegonSpringsMineralWater,Inc.,discoversthatchil-

dren withdentalproblemsarelesscommoninfamiliesthatregularlybuybottledwater than infamiliesthatdonot.Explainwhythisassociationneednotreflectacausal link betweendrinkingbottledwaterandhavingfewerdentalproblems.Identifylurking variablesthatcouldberesponsiblefortheresult,andexplainhow.

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