Carefully analyze the four argumentative excerpts presented below, each of which exhibits a distinct logical defect. Which abstract description correctly identifies the primary reasoning flaw in each corresponding argument?
- Archaeologist: Historians attribute the sudden decline of the coastal settlement either to prolonged regional drought or to devastating naval raids. Recent sediment cores confirm that rainfall levels remained stable throughout that century; therefore, the settlement must have fallen to naval raids.Treats two alternative explanations as mutually exhaustive while failing to establish that no other causal factors could account for the outcome.
- Marine Biologist: Over the past decade, coastal coral bleaching incidents rose concurrently with the expansion of commercial catamaran tours in the bay. Since the tour boats operate precisely where bleaching occurs, the chemical sunscreen washed from tourists is clearly the primary driver of the coral degradation.Concludes that one phenomenon caused another based merely on their spatial and temporal co-occurrence, overlooking plausible alternative explanations such as a common underlying factor.
- Mechanical Engineer: Every individual fastener, housing bracket, and rotor blade designed for our prototype wind generator is exceptionally lightweight. It follows that the fully assembled generator will be light enough to be transported manually by a single technician.Assumes without warrant that a collection of components possesses a characteristic simply because each separate part possesses that characteristic.
- Environmental Inspector: Standard municipal chromatography assays failed to detect any traces of halogenated solvents in the town's primary aquifer during last month's scheduled safety audit. We can therefore conclude that the aquifer is completely uncontaminated by industrial solvents.Infers the absolute nonexistence of a condition solely from the failure of an inquiry to establish its existence.
Answer
The archaeologist's argument matches the description of treating two alternative explanations as mutually exhaustive; the marine biologist's argument matches concluding causation from spatial and temporal co-occurrence; the mechanical engineer's argument matches assuming a whole possesses a property because its individual parts do; and the environmental inspector's argument matches inferring nonexistence of a condition solely from failure to establish its existence.
Each argument corresponds directly to an established structural flaw in formal logic: the archaeologist limits possibilities to an unjustified binary choice; the marine biologist treats correlation as definitive proof of causation; the engineer commits a part-to-whole error of composition; and the inspector treats non-detection as proof of total absence.
Step-by-Step Solution
Key Concept
Flaw in the Reasoning: Structural Fallacy Identification
Estimated Time:2m 0s