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Difficulty: EasyAssumptions in Causal Arguments

A recent study of adult diets revealed that individuals who drink at least one cup of green tea daily have a significantly lower incidence of heart disease compared to those who do not drink green tea. The researchers concluded that consuming green tea actively protects against the development of heart disease.

Which of the following are necessary assumptions upon which the researchers' causal argument depends? (Select all that apply)

  1. The individuals in the study who drank green tea did not also engage in other heart-healthy behaviors at significantly higher rates than the non-drinkers.Answer
  2. People who naturally have healthier cardiovascular systems do not inherently crave green tea more than those with poorer cardiovascular health.Answer
  3. C
    Drinking green tea is sufficient to completely prevent the development of heart disease in adults.
  4. D
    The majority of individuals in the study were already aware of the potential health benefits of green tea before participating.
  5. E
    A higher percentage of green tea drinkers mathematically guarantees a larger total number of healthy individuals in the overall population.

Answer

The correct answers are the statements ruling out alternate causes for the lower heart disease incidence (such as other healthy behaviors) and ruling out reverse causation (the possibility that having a naturally healthy heart causes one to crave green tea).
The argument assumes that the observed correlation is truly a direct causal relationship. For this to be logically sound, the researchers must assume that other factors (like additional healthy lifestyle choices) did not independently cause the lower heart disease rate, and they must also assume that having a naturally healthy heart did not simply cause a preference for green tea. The correct statements perfectly address and rule out these two specific causal threats (alternate cause and reverse causation).

Step-by-Step Solution

1
Identify the argument's premises and main conclusion.
Premise: There is a correlation between drinking green tea and a lower incidence of heart disease. Conclusion: Drinking green tea actively protects against heart disease.
Understanding the structure of the argument is required before analyzing its logical gaps.
2
Identify the core logical flaw or gap.
The argument jumps from a mere correlation in a study to an absolute causal relationship.
In logical reasoning, observing that two things happen together does not automatically prove that one caused the other.
3
Determine the necessary assumptions required to bridge this causal gap.
A valid causal conclusion requires assuming that there are no alternate causes for the effect, that the relationship is not backward (reverse causation), and that the correlation is not purely coincidental.
These are the standard assumptions any causal argument must rely upon to be logically sound.
4
Evaluate the given options using the negation test.
Negating the statement about alternate healthy behaviors or the statement about reverse craving destroys the argument's causal claim, confirming they are both necessary assumptions.
If an assumption is truly necessary, its logical negation will severely weaken or destroy the main conclusion.

Key Concept

Assumptions in Causal Arguments
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Assumptions in Causal Arguments

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