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Zorluk: OrtaLogical Arguments and Causal Relationships

A marine research consortium monitored 40 coastal inlets over a three-year period to evaluate the impact of deploying synthetic kelp modules intended to restore abalone populations. Inlets equipped with synthetic kelp modules exhibited a 30 percent increase in juvenile abalone survival relative to control inlets lacking the modules. Based on these findings, a lead biologist hypothesized that synthetic kelp modules increased juvenile abalone survival by providing physical shelter from predatory sea otters.

Select for Column 1 the statement that most strongly strengthens the biologist's shelter hypothesis against potential confounding factors. Select for Column 2 the statement that exemplifies a causal direction reversal regarding abalone population density and synthetic kelp module presence.

  • Column 1: Statement that strengthens the shelter hypothesisInlets with synthetic kelp modules saw a steep decline in otter-related abalone mortality, while control inlets with equal otter presence saw no such decline.
  • Column 2: Statement demonstrating causal direction reversalHigher pre-existing densities of juvenile abalone release chemical signals that lead field technicians to select those specific inlets for synthetic kelp module placement.

Cevap

For Column 1, the statement strengthening the shelter hypothesis is the observation that inlets with synthetic kelp modules saw a steep decline in otter-related abalone mortality while control inlets saw no such decline. For Column 2, the statement demonstrating causal direction reversal is the claim that higher pre-existing densities of juvenile abalone cause technicians to deploy synthetic kelp modules in those specific inlets.
For Column 1, demonstrating that otter-specific predation declined exclusively in inlets containing synthetic kelp directly validates the predator-shelter mechanism proposed by the biologist. For Column 2, asserting that higher existing abalone concentrations cause human teams to deploy synthetic kelp modules reverses the assumed causal direction, positioning abalone density as the cause rather than the effect.

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1
Analyze the causal argument in the stem
The biologist proposes a specific causal link: Synthetic kelp modules provide physical shelter from sea otters →\rightarrow reduced predation →\rightarrow increased juvenile abalone survival.
Understanding the precise mechanism is necessary to evaluate strengthening evidence and causal direction.
2
Evaluate candidate statements for Column 1 (Strengthening the shelter hypothesis)
The statement noting a steep decline in otter-related mortality specifically in module-equipped inlets compared to control inlets directly confirms the proposed predator-shelter mechanism, strengthening the biologist's conclusion.
Demonstrating that the specific hypothesized mediator (reduced otter predation) occurred exclusively where the treatment was applied confirms the causal pathway.
3
Evaluate candidate statements for Column 2 (Causal direction reversal)
The statement explaining that higher pre-existing abalone densities prompt technicians to place synthetic kelp modules in those locations turns the causal arrow around: Abalone Density→Kelp PlacementAbalone\ Density \rightarrow Kelp\ Placement instead of Kelp Placement→Abalone DensityKelp\ Placement \rightarrow Abalone\ Density.
Causal direction reversal occurs when the assumed effect is actually the cause driving the assumed intervention.

Anahtar Kavram

Two-Part Causal Analysis and Direction Reversal
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Konular

Logical Arguments and Causal Relationships

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