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Difficulty: MediumAssumptions in Causal Arguments

An anthropologist studied several isolated farming communities in the Andean highlands. The study revealed that communities primarily cultivating a specific heirloom variety of quinoa have significantly lower rates of cardiovascular disease than neighboring communities that cultivate standard commercial crops. Based on this observation, the anthropologist concluded that consuming this heirloom variety of quinoa provides unique protective benefits for cardiovascular health.

Which of the following are necessary assumptions required by the anthropologist's argument? (Select all that apply.)

  1. The communities cultivating the heirloom quinoa do not have other unique lifestyle habits that are the primary reason for their comparatively lower rates of cardiovascular disease.Answer
  2. The residents of the communities that cultivate the heirloom quinoa actually consume a significant portion of the heirloom quinoa they produce.Answer
  3. C
    Consuming this specific heirloom variety of quinoa is sufficient to completely prevent the development of cardiovascular disease.
  4. D
    The neighboring communities that cultivate standard commercial crops have a diet consisting primarily of heavily processed foods.
  5. E
    A lower rate of cardiovascular disease inherently causes a farming community to prefer cultivating heirloom crops over standard commercial crops.

Answer

The correct answers are the options stating that the communities do not have other unique lifestyle habits accounting for their health, and that the residents actually consume the quinoa they produce.
The argument requires two key unstated premises to bridge its logical gaps. First, because it moves from a premise about 'cultivating' to a conclusion about 'consuming', it must assume that the communities are actually eating the crops they grow. Second, because it assumes a causal relationship based on a correlation, it must assume that other potential causes (like different lifestyle habits) are not the true reason for the lower disease rates.

Step-by-Step Solution

1
Analyze the argument's structure to identify the premises and the main conclusion.
Premise: Communities cultivating heirloom quinoa have lower cardiovascular disease rates than those cultivating standard crops. Conclusion: Consuming the heirloom quinoa protects cardiovascular health.
Deconstructing the argument is necessary to spot the logical gaps between the evidence provided and the claim being made.
2
Identify the shifts in language and logic between the premises and the conclusion.
There are two major gaps: 1) The shift from 'cultivating' in the premise to 'consuming' in the conclusion. 2) The shift from a mere correlation (quinoa cultivation and low disease rates) to a definitive causal claim (quinoa consumption causes the health benefit).
Identifying these gaps reveals the unstated premises (assumptions) the author relies upon to make the argument work.
3
Evaluate the options using the Negation Technique to test if they are strictly necessary for the conclusion to hold.
Negating the option about lifestyle habits (they DO have other habits causing the health benefits) destroys the conclusion. Negating the option about consumption (they DO NOT consume what they cultivate) severs the link to the conclusion. Both are necessary assumptions.
The Negation Technique is the most reliable way to confirm whether an assumption is truly necessary for a causal argument.

Key Concept

Identifying necessary assumptions in causal reasoning (ruling out alternate causes and bridging language gaps).
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Assumptions in Causal Arguments

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