The four argumentative excerpts below each commit a distinct logical fallacy. Match each flawed argument with the abstract description that most accurately characterizes its primary inferential vulnerability.
- Astrophysicist: In scientific inquiry, an 'observation' is strictly defined as an empirical measurement recorded by a physical sensing apparatus. However, theoretical cosmologists routinely assert that their mathematical models generate novel 'observations' concerning the topology of early spacetime. Therefore, these theorists must be directly manipulating physical laboratory instruments.It illicitly trades upon two distinct meanings of a key term, shifting from a narrow technical definition to a conceptual or metaphorical usage.
- Paleoclimatologist: Marine geological records confirm that whenever extensive continental glaciation has taken place, atmospheric carbon dioxide concentrations have invariably fallen below 200 parts per million. Consequently, if international climate protocols successfully reduce atmospheric carbon dioxide below 200 parts per million, a period of extensive continental glaciation will be triggered.It treats a condition that is necessary for bringing about a given state of affairs as though it were sufficient to guarantee that outcome.
- Ergonomist: Every individual component in our redesigned modular assembly station—including the pneumatic lift, the articulated arm, and the anti-fatigue matting—has been independently verified to reduce worker musculoskeletal strain by at least ten percent. It follows that implementing the entire integrated assembly station will reduce total worker musculoskeletal strain by at least ten percent.It presumes without justification that an attribute possessed by every constituent part of a system is necessarily a property of the unified whole.
- Cartographer: The regional transit authority must either develop an expensive proprietary smartphone navigation application or continue subsidizing the mass printing of multi-fold paper route maps at a recurring loss. Because current fiscal constraints make subsidizing printed paper maps impossible, the authority must immediately commission the proprietary smartphone application.It assumes that only two mutually exclusive alternatives exist when other plausible intermediate options remain unaddressed.
Answer
The astrophysicist's argument matches the description of illicitly shifting between two distinct meanings of a key term; the paleoclimatologist's argument matches the description of treating a necessary condition as a sufficient condition; the ergonomist's argument matches the description of erroneously inferring that a property of individual parts applies to the whole; and the cartographer's argument matches the description of assuming an unjustified binary choice.
Each flawed argument exhibits a classic structural vulnerability: the astrophysicist relies on a semantic shift (equivocation); the paleoclimatologist mistakes a necessary condition for a sufficient trigger (conditional reversal); the ergonomist assumes that features of individual components aggregate uniformly to the whole system (fallacy of composition); and the cartographer artificially limits the decision space to two extreme options (false dilemma).
Step-by-Step Solution
Key Concept
Identifying Formal and Informal Logical Flaws in Deductive Reasoning
Estimated Time:2m 30s