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Zorluk: ZorAssumptions in Causal Arguments

Researchers analyzing sediment cores from Lake Voltonia have identified a precipitous drop in the concentration of pollen from domesticated cereal crops dating precisely to the early 14th century. Historical archives from the surrounding region indicate that a severe, prolonged economic depression began during the exact same period. Based on this correlation, the researchers conclude that the economic depression must have triggered a mass abandonment of agricultural lands, which in turn caused the observed reduction in cereal crop pollen.

Which of the following is an assumption on which the researchers' argument depends?

  1. The reduction in cereal crop pollen and the regional economic depression were not both the result of a severe environmental shift.Cevap
  2. B
    The economic depression in the 14th century was the sole reason why farmers in the Lake Voltonia region abandoned their agricultural lands.
  3. C
    Prior to the 14th century, domesticated cereal crops were the most economically vital agricultural commodity in the region surrounding Lake Voltonia.
  4. D
    During the early 14th century, there was no significant reduction in the amount of pollen from wild, uncultivated plant species found in the sediment cores.
  5. E
    The magnitude of the reduction in cereal crop pollen was directly proportional to the severity of the economic depression documented in the historical archives.

Cevap

The assumption that the reduction in crop pollen and the economic depression were not both caused by a severe environmental shift.
In any LSAT argument that moves from a correlation (two things happening at the same time) to a causal conclusion (one thing caused the other), the author inherently assumes that there is no third factor that caused both events. The correct option explicitly rules out a plausible third factor (a severe environmental shift). If we negate this option—assuming that an environmental shift actually DID cause both the drop in pollen and the economic depression—the author's conclusion that the depression caused the drop in pollen is completely destroyed. This proves the assumption is strictly necessary.

Adım Adım Çözüm

1
Identify the premises and the main conclusion of the argument.
Premises: Cereal crop pollen dropped in the 14th century, and an economic depression began at the exact same time. Conclusion: The depression caused a mass abandonment of farms, which reduced the pollen.
Deconstructing the argument structure is essential to finding the logical gap between the evidence (a correlation) and the conclusion (a specific causal claim).
2
Analyze the nature of the logical gap.
The argument observes a correlation in time (depression and pollen drop) and assumes a specific direction of causation (depression led to farm abandonment which led to pollen drop).
Causal conclusions drawn from correlations are inherently flawed because they fail to account for alternate causes, reverse causation, or a third independent variable causing both phenomena.
3
Formulate what the necessary assumption must do.
A necessary assumption must defend the causal claim by ruling out one of the alternative explanations, such as a third variable causing both the economic depression and the crop failure.
Defender assumptions protect the argument from potential vulnerabilities. If a third variable caused both, the argument's specific causal chain falls apart.
4
Apply the negation technique to the options to verify necessity.
Negating the correct option yields: 'An environmental shift caused BOTH the pollen drop and the economic depression.' This completely destroys the conclusion that the depression caused the pollen drop.
The negation test is the definitive method for confirming necessary assumptions on the LSAT.

Anahtar Kavram

Assumptions in Causal Arguments (Defender Assumption / Ruling Out Alternate Causes)
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Konular

Assumptions in Causal Arguments

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