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Zorluk: OrtaLogical Arguments and Causal Relationships

An agricultural research team evaluated the impact of a new organic bio-fertilizer, BioCrop, on wheat yield across 60 regional farms. The study observed that farms utilizing BioCrop produced an average wheat yield 25% higher than farms using traditional synthetic fertilizers. Consequently, the lead researcher concluded that applying BioCrop directly causes an increase in wheat yield.

Which of the following statements, if true, would weaken the lead researcher's causal conclusion by presenting an alternative explanation or confounding variable? Select TWO correct statements.

  1. Farms that used BioCrop were also equipped with modern drip-irrigation systems that optimized water delivery during critical growth stages.Cevap
  2. Farmers selected for the BioCrop group applied the product primarily to fields with higher baseline soil nutrient levels recorded prior to the study.Cevap
  3. C
    Higher wheat yields cause farmers to invest more revenue into purchasing premium fertilizers like BioCrop for future planting seasons.
  4. D
    Traditional synthetic fertilizers are significantly less expensive to purchase per acre than BioCrop.
  5. E
    BioCrop contains higher concentrations of nitrogen compounds than standard organic composts.

Cevap

The two statements that weaken the conclusion are the statement regarding modern drip-irrigation systems and the statement regarding higher baseline soil nutrient levels.
The correct selections both introduce plausible alternative explanations for the observed higher yield. If farms using BioCrop also used drip-irrigation systems or already possessed superior soil fertility, the yield increase cannot be definitively attributed to BioCrop itself.

Adım Adım Çözüm

1
Identify the causal argument structure
Premise: Farms using BioCrop had 25% higher yields than farms using traditional fertilizer. Conclusion: BioCrop directly causes the yield increase.
To weaken a causal claim (X↛YX \nrightarrow Y), one must demonstrate alternative causes (Z↛YZ \nrightarrow Y), reverse causality, or flawed experimental control.
2
Evaluate alternative explanations and confounding factors
The option noting drip-irrigation introduces an unobserved factor (ZZ) that improves yield. The option noting higher baseline soil nutrient levels indicates that the treatment group was inherently more fertile prior to BioCrop application.
Both factors provide plausible alternative reasons for the 25% higher yield that do not depend on BioCrop's effectiveness.
3
Eliminate invalid options
The options addressing purchasing cost, chemical comparison with compost, and future investment patterns fail to weaken the specific observational study's conclusion.
Irrational or irrelevant factors do not address the logical validity of the causal inference.

Anahtar Kavram

Evaluating Alternative Causes and Confounding Variables in Causal Arguments
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Logical Arguments and Causal Relationships

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