Argument Evaluation

Consumer Advocate: The manufacturer of the Apex blender knew that its motor could overheat and catch fire if used continuously for more than ten minutes. Instead of redesigning the motor, the manufacturer simply included a warning in the user manual advising against continuous use beyond ten minutes. Because it is highly predictable that many consumers will not read the manual before using a kitchen appliance, the manufacturer is fully responsible for the property damage caused by the blender fires.

Which one of the following principles, if valid, most helps to justify the consumer advocate's reasoning?

Criminologist: The city council insists its new zero-tolerance policing strategy is succeeding, citing a 15 percent reduction in overall violent crime over the six months since the strategy was launched. This evidence, however, is meaningless. Over those same six months, a regional economic collapse caused the city's total population to plummet by roughly 20 percent as residents relocated. Consequently, the zero-tolerance strategy has had absolutely no effect on the incidence of violent crime.

The criminologist's argument is vulnerable to criticism on the grounds that it illicitly infers a causal relationship between the policing strategy and the reduction in crime based solely on a chronological correlation.

Meteorologist: Historical agricultural data reveals that the regional almond harvest faces critical risk only when the total seasonal volume of rainfall drops below 15 inches. Over the past five years, the percentage of days during the growing season on which any measurable precipitation occurred has decreased by nearly 40%. Consequently, the region must be moving dangerously close to the 15-inch threshold that threatens the almond harvest.

Which of the following most accurately describes a flaw in the meteorologist's reasoning?

Art Historian: Extensive chemical analysis confirms that the newly discovered portrait *Lady in Blue* contains genuine ultramarine pigment. Historical records demonstrate that only paintings created prior to the eighteenth century contain genuine ultramarine pigment. Therefore, *Lady in Blue* is undoubtedly a highly valuable artwork.

Statement: The assumption 'Any painting that is highly valuable was created prior to the eighteenth century' is a sufficient assumption that, if added to the premises, logically guarantees the art historian's conclusion.

Consider the following argument by a linguist:

Any constructed language that lacks a mechanism for expressing counterfactuals cannot be fully adopted as a primary language by a speech community. The newly developed language, Novial-X, lacks complex temporal modifiers. Therefore, Novial-X will never be fully adopted as a primary language by a speech community.

The assumption that 'any constructed language that lacks a mechanism for expressing counterfactuals also lacks complex temporal modifiers' is sufficient to logically guarantee the linguist's conclusion.

Review the four distinct arguments provided below. For each argument, identify the corresponding abstract principle that, if assumed to be true, logically guarantees the argument's conclusion.

Epidemiologist: To evaluate the long-term safety of the new dietary supplement Novagen, researchers conducted a comprehensive five-year study. They tracked 5,000 individuals who consumed Novagen daily for the entire five-year period and compared them to a control group of 5,000 individuals who never consumed it. The researchers ensured both groups were strictly matched for age, diet, exercise habits, and initial cardiovascular health. The data shows that the individuals who consumed Novagen daily for five years had a 40 percent lower incidence of cardiovascular disease than the control group. This conclusively demonstrates that long-term, daily consumption of Novagen provides significant protection against cardiovascular disease.

Which of the following, if true, most seriously weakens the epidemiologist’s argument?

Financial analyst: Any regional bank that aggressively expands its commercial lending operations faces increased regulatory scrutiny. Over the past year, Sentinel Bank has aggressively expanded its commercial lending operations. It is clear, therefore, that Sentinel Bank will have to hire additional internal compliance officers.

The conclusion of the financial analyst's argument follows logically if which one of the following is assumed?

Ethicist: Dr. Lin is conducting a sociological study that involves observing the behavior of people in public parks without their knowledge or explicit consent. Some critics argue that this violates the subjects' right to privacy. However, Dr. Lin records only generalized, anonymized data, capturing no identifying characteristics whatsoever. Furthermore, the individuals being observed have chosen to enter a completely public space where they can be seen by anyone. Therefore, Dr. Lin's study does not violate the subjects' right to privacy.

Which one of the following principles, if valid, most helps to justify the ethicist's reasoning?

Legal Scholar: A contract is morally binding on a consumer only if the consumer was afforded a reasonable opportunity to negotiate its terms. Software end-user license agreements (EULAs) are presented to consumers strictly on a "take-it-or-leave-it" basis. However, failing to enforce EULAs would lead to rampant software piracy, ultimately destroying the software industry. Therefore, because the software company Vertex required its customers to explicitly click "I agree" before accessing its latest program, Vertex is morally justified in enforcing its EULA against users who pirate the software.

Which one of the following principles, if valid, most helps to justify the legal scholar's reasoning?

Urban Planner: The city charter mandates that all new residential developments must preserve the 'historical character' of the neighborhood. The developers of the proposed high-rise apartment complex argue that their building preserves historical character because it will securely house an extensive library of local historical archives. Since the new building will indeed preserve these archives, we must conclude that the developers' proposal strictly adheres to the city charter's mandate.

The urban planner's reasoning is flawed because it trades on an ambiguity with respect to the phrase 'historical character'.

Below are four excerpts from public policy and economic debates. For each argument on the left, identify the single factual statement on the right that, if true, would pose the most severe logical challenge to the speaker's conclusion.

Match each of the following incomplete arguments with the sufficient assumption that, if added as a premise, would logically guarantee its conclusion.

Analyze the four arguments below. Match each argument (Left) to the specific piece of new evidence (Right) that most severely weakens its conclusion by exposing its underlying logical flaw.

Political Theorist: A thriving democracy requires a well-informed electorate. Therefore, since the newly formed Republic of Sanor has established a comprehensive public education system that guarantees every citizen access to accurate political information, we can be confident that Sanor will soon enjoy a thriving democracy.

Statement: The argument is flawed because it takes for granted that a comprehensive public education system is the only possible method for producing a well-informed electorate.

Does the statement accurately describe the logical flaw committed in the political theorist's argument?

Agronomist: The widespread adoption of the genetically modified "Xertex-wheat" in the arid Zephyr Valley is a triumph of biological engineering. Over the five years since farmers switched entirely to Xertex-wheat—maintaining the exact same total acreage of wheat cultivation and utilizing the identical irrigation infrastructure—the annual volume of irrigation water required to prevent crop failure has decreased by 30%. Because rainfall and temperatures have remained strictly constant over the last decade, this reduction conclusively demonstrates that an individual Xertex-wheat plant intrinsically requires significantly less water to survive than an individual plant of the traditional wheat varieties.

Which one of the following, if true, most seriously weakens the agronomist's argument?

Analyze the following four arguments. Match each flawed argument stimulus with the abstract description that most accurately identifies its reasoning error.

Corporate Ethicist: A company's board of directors has a fiduciary duty to act in the best interests of the corporation's shareholders. Recent surveys show that the vast majority of our shareholders are highly interested in seeing immediate, aggressive expansion into emerging markets. Therefore, to fulfill their fiduciary duty, our board of directors must pursue this aggressive expansion strategy.

Which of the following most accurately describes a flaw in the corporate ethicist's reasoning?

Medical Ethicist: A pharmaceutical firm with limited manufacturing capacity must choose whether to produce Drug X or Drug Y. Drug X provides a complete cure for a very rare and debilitating disease, while Drug Y provides moderate relief for a minor but extremely common ailment. Although the firm can produce enough of Drug X to treat only fifty patients a year, and enough of Drug Y to treat tens of thousands, the firm should choose to produce Drug X.

Which one of the following principles, if valid, most helps to justify the medical ethicist's reasoning?

Financial Analyst: Five years ago, the national government eliminated subsidies for domestic solar panel manufacturers. Since then, the total revenue of the domestic solar industry has increased by 40 percent. Conversely, the domestic wind turbine manufacturing sector, which retained its government subsidies, saw only a 5 percent increase in total revenue over the same period. Clearly, in the renewable energy sector, government subsidies stifle revenue growth rather than encourage it.

Which of the following, if true, most seriously weakens the financial analyst's argument?