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Zorluk: OrtaCausal Flaws and Confounding Variables

Passage: A commercial shipping logistics firm retrofitted half of its cargo fleet with synthetic polymer lubricants, while the remaining half continued using traditional petroleum lubricants. Over a two-year observation period, vessels using synthetic polymer lubricants reported 40% fewer engine overheating incidents. The operations director concluded that synthetic polymer lubricants directly reduce the frequency of engine overheating.

Statement: The fact that vessels using synthetic polymer lubricants were assigned exclusively to cold-water northern trade routes, where lower sea surface temperatures naturally assist engine cooling, functions as a confounding variable that weakens the operations director's causal conclusion.

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True. The exclusive assignment of synthetic-lubricant vessels to cold-water routes introduces a confounding variable (ambient sea temperature) that offers an alternative explanation for the decreased engine overheating, thereby weakening the director's causal claim.
The statement accurately identifies a classic confounding variable. In causal arguments, when the test group differs from the control group in a systematic background condition (route temperature) that independently influences the measured outcome (engine overheating), the argument commits a causal flaw by overlooking an alternative explanation.

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1
Analyze the causal claim in the passage.
Premise: Ships with synthetic polymer lubricants had 40% fewer overheating incidents than ships with petroleum lubricants. Conclusion: Synthetic polymer lubricant directly causes the reduction in engine overheating.
Deconstructing the argument isolates the observed correlation and the author's causal inference.
2
Evaluate the statement's potential as a confounding variable.
The statement reveals that the synthetic-lubricant group was systematically exposed to lower ambient temperatures (cold northern routes), which independently cool engines.
A confounding variable is an extrinsic factor correlated with both the cause and outcome that offers a competing explanation for the observed effect.
3
Determine the effect on the causal conclusion.
Because cold water independently prevents overheating, one cannot determine whether the reduced overheating was caused by the lubricant or the route climate. Therefore, the factor in the statement serves as a valid confounder that weakens the argument.
Establishing that an alternative cause accounts for the outcome confirms that the statement accurately identifies a causal flaw.

Anahtar Kavram

Third-variable confounding in causal reasoning
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Causal Flaws and Confounding Variables

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