Assumptions

Archaeologist: Recent excavations of the ancient settlement of Tlanex indicate a stark division in material culture. The highland sector contains thousands of intricately carved jade artifacts, whereas the lowland sector contains almost exclusively unpolished clay implements. Because the jade artifacts required hundreds of hours of specialized labor to produce, they were undoubtedly luxury items of immense value. Consequently, the inhabitants of the highland sector must have belonged to a significantly higher socioeconomic class than the inhabitants of the lowland sector.

Which one of the following is an assumption required by the archaeologist's argument?

Agricultural Scientist: The new Lumina strain of tomatoes has been genetically modified to produce a natural compound that repels the silverleaf whitefly, a major agricultural pest. In controlled greenhouse trials, Lumina plants suffered 80 percent less whitefly damage than conventional tomato plants. Therefore, transitioning to the Lumina strain in our region's commercial outdoor farms will undoubtedly lead to a significant increase in overall tomato yields.

Which one of the following is an assumption required by the agricultural scientist's argument?

Sociologist: A recent corporate study found that employees who participated in an optional weekly mindfulness meditation program reported a 40 percent lower rate of workplace stress compared to employees who did not participate. This demonstrates that practicing mindfulness meditation directly reduces workplace stress.

Which one of the following is an assumption required by the sociologist's argument?

A recent study of adult diets revealed that individuals who drink at least one cup of green tea daily have a significantly lower incidence of heart disease compared to those who do not drink green tea. The researchers concluded that consuming green tea actively protects against the development of heart disease.

Which of the following are necessary assumptions upon which the researchers' causal argument depends? (Select all that apply)

An archaeologist argues: 'Pottery fragments from the ancient Zanthian culture found in coastal excavations are consistently much harder than those found at inland Zanthian sites. This proves that centuries of exposure to salty coastal air chemically strengthened the clay.'

To protect this causal argument from criticism, the archaeologist must assume several 'defender' statements that rule out alternate explanations. Match each alternate explanatory objection below to the specific defender assumption that logically neutralizes it.

Match each logical argument to the specific statement that, if assumed, enables the argument's conclusion to be properly drawn.

Archaeologist: The abandonment of the thriving ancient settlement of Kelior is generally attributed to a century-long regional drought. However, isotopic analysis of soil strata indicates that less than a decade before the abandonment, Kelior's farmers abruptly transitioned from cultivating teff, a highly drought-resistant grain, to a variety of water-intensive marsh-rice. Therefore, it was actually this ill-advised agricultural pivot, rather than the drought alone, that precipitated the settlement's collapse by engineering a catastrophic famine.

The archaeologist's argument relies on which one of the following assumptions?

Researchers recently observed that office workers who regularly consume green tea report experiencing significantly lower levels of daily stress than those who do not. Furthermore, among the workers observed, those who consume the greatest amount of green tea report the lowest stress levels. The researchers conclude that the antioxidants present in green tea act directly on the nervous system to reduce stress.

Which one of the following is an assumption on which the researchers' argument depends?

Match each causal argument below to the specific category of necessary assumption it fundamentally relies upon.

Analyze the following flawed arguments, all of which share a common set of variables regarding commercial development. Match each argument with the specific missing assumption required to make its conclusion logically follow.

Read the argument below and evaluate whether the provided statement functions as a necessary assumption.

Historian: The invention of writing must have been driven by the need to manage the increasingly complex trade networks of early agricultural surpluses, not by the administrative demands of large-scale monumental building projects. The traditional theory favoring monumental architecture as the primary catalyst is decisively refuted by recent excavations at Oruk, which reveal that complex record-keeping systems were fully established centuries before the construction of any such monuments.

Statement: The administrative demands associated with large-scale monumental building projects did not arise centuries before the actual physical construction of such monuments began.

When evaluating arguments on the LSAT, determining whether an assumption is strictly necessary requires properly applying the Negation Technique. This involves identifying the precise logical contradictory of a candidate statement. Match each candidate assumption regarding workforce productivity on the left with its precise logical negation on the right.

Biologist: The prehistoric canid *Aetocyon* must have lived and hunted in large social groups. The recent discovery of fossilized *Aetocyon* reveals that these animals had highly specialized jaw structures adapted exclusively for crushing large bones. In the modern world, bone-crushing predators such as spotted hyenas hunt in large, coordinated packs in order to take down large prey.

Which of the following are necessary assumptions on which the biologist's argument depends? (Select all that apply.)

Ethicist: A moral theory is practically viable only if it can be consistently applied by ordinary individuals in their daily lives. Because Utilitarianism requires a level of cognitive effort that far exceeds the psychological capacity of average humans, it is impossible for ordinary individuals to consistently apply it. Consequently, Utilitarianism cannot serve as the foundational moral framework for a functioning society.

Which one of the following is an assumption on which the ethicist's argument depends?

Match each logical reasoning stimulus with the necessary supporter assumption required to logically bridge the conceptual gap between its premises and its conclusion.

Paleontologist: Confidently establishing the basal metabolic rate of any extinct dinosaur species requires researchers to analyze the isotopic composition of its fossilized tooth enamel. The recently excavated skeletal remains of the Tectodon, however, were unearthed exclusively from the remnants of highly acidic ancient peat bogs. Consequently, despite having complete skeletons, researchers will be unable to confidently establish the basal metabolic rate of the Tectodon.

The paleontologist's argument depends on assuming which one of the following?

Sociologist: A comprehensive ten-year study tracked adolescents and their video gaming habits. The researchers found that adolescents who predominantly played cooperative multiplayer video games exhibited significantly higher scores on standardized assessments of real-world conflict resolution than adolescents who predominantly played competitive single-player games. Based on these findings, we can safely conclude that engaging in cooperative multiplayer gaming actively fosters and enhances a teenager's ability to resolve interpersonal conflicts.

Which one of the following is an assumption on which the sociologist's argument depends?

If a scientific paradigm is fundamentally unfalsifiable, it cannot serve as the foundation for a robust empirical research program. A paradigm is fundamentally unfalsifiable only if its core propositions are completely insulated from observable phenomena. Dr. Aris's new framework of consciousness features core propositions that are deeply intertwined with observable neurological phenomena. It follows that Dr. Aris's framework can serve as the foundation for a robust empirical research program.

Which one of the following, if assumed, enables the conclusion to be properly drawn?

Ten years ago, the national government introduced a substantial tax on plastic packaging used by food manufacturers. Since the tax was implemented, the volume of plastic waste deposited in the nation's municipal landfills has decreased by 30 percent. Economists assert that the tax achieved its intended goal, concluding that the financial penalty forced food manufacturers to switch to biodegradable packaging alternatives, thereby reducing the amount of plastic waste generated.

Which one of the following is an assumption required by the economists' argument?

Analyze each of the following logical arguments. Match each argument to the specific sufficient assumption that, if added to its premises, strictly and logically guarantees the truth of its conclusion.