Making Inferences Flashcards

Read the following passage: "The settlement's council voted unanimously to expand the irrigation network, yet the agricultural yields the following season fell to their lowest point in a decade. The council chair, in her annual address, cited 'unforeseen complications in implementation' without elaborating further. Three council members declined to seek re-election that autumn." Which inference is most strongly supported by the passage?

Answer: The irrigation expansion was executed poorly, and council members anticipated political consequences.

The passage links the failed irrigation expansion to vague language from the chair ('unforeseen complications in implementation') and the departure of three members before facing voters. This pattern most strongly supports an inference of poor execution with anticipated political fallout. Choice B introduces motive not supported by the text. Choice C invents an external cause. Choice D conflates unanimous voting with equal blame, which the text does not address.

A researcher studying medieval trade routes notes: "Amber beads originating from the Baltic coast have been excavated at sites across the Byzantine Empire, yet no written trade agreements between Baltic and Byzantine merchants survive from this period. Byzantine tax records, however, show recurring entries for 'northern resins' assessed at luxury rates." What inference can most reasonably be drawn from this evidence?

Answer: Baltic amber reached Byzantine markets through intermediary trade networks rather than direct exchange.

The physical presence of Baltic amber combined with the absence of direct trade agreements, but the presence of tax records, suggests goods moved through intermediaries — middlemen who would not appear in bilateral Byzantine-Baltic contracts. Choice B is speculation unsupported by the text. Choice C misreads 'luxury rates' as discouragement rather than revenue collection. Choice D is an unwarranted leap; absence of contracts does not imply illegality.

The following is an excerpt from a sociological study: "In the surveyed municipalities, communities with higher rates of library card ownership consistently reported lower rates of payday loan usage. This correlation held even when controlling for median household income." A student claims: 'Therefore, libraries cause people to make better financial decisions.' Which of the following most accurately describes a flaw in this inference?

Answer: The inference treats correlation as causation without ruling out a third variable that may explain both outcomes.

The student's inference commits the classic correlation-causation error. A third variable — such as civic engagement, educational attainment, or community cohesion — could independently produce both higher library usage and lower payday loan dependency. Choice B identifies a real limitation but does not explain the specific logical flaw in the causal claim. Choice C introduces a debate about measurement validity that is outside the passage's scope. Choice D contradicts the passage, which states the correlation held even after controlling for income.

An author writes: "Marcelline had always assumed her grandmother's silence about the war years was grief. It was only at the estate sale, sorting through a box of uncashed pension checks from the veterans' bureau, that Marcelline finally understood the geometry of that silence." What does 'the geometry of that silence' most likely imply about Marcelline's inference?

Answer: The grandmother's silence was structured around a deliberate rejection of her veteran identity, not solely grief.

The phrase 'geometry of silence' implies shape and intention — silence with structure rather than mere absence. Uncashed pension checks suggest the grandmother received but refused veteran benefits, pointing to a principled or psychologically complex rejection of that identity, not simple grief. Choice B is literal and ignores figurative language. Choice C is contradicted by the existence of pension checks, which require prior service. Choice D introduces a financial deception angle that the passage does not support.

Passage: "Species X was observed foraging exclusively at dawn and dusk during summer months, but field notes from the same region in winter recorded Species X active throughout daylight hours. Researchers also noted that the region's apex predator, Species Y, is strictly diurnal and hibernates in winter." Which of the following inferences about Species X is best supported by the passage?

Answer: Species X adjusts its activity patterns in response to predation pressure from Species Y.

The key observation is that Species X is crepuscular when its predator (Species Y) is active and diurnal in winter precisely when Species Y hibernates. This pattern is most parsimoniously explained by predator avoidance. Choice B introduces temperature as a cause, which the passage does not mention. Choice C speculates about competition with no textual basis. Choice D is directly contradicted by the winter behavior described.

An economist writes: "Country A introduced a minimum wage increase in January. By March, unemployment in Country A had risen 2%. Across the border, Country B — with an identical economy and no minimum wage change — saw unemployment rise 1.9% over the same period." A journalist concludes: 'The minimum wage increase caused Country A's unemployment to rise.' Which inference from the data is actually most defensible?

Answer: A regional economic shock likely affected both countries similarly, making the minimum wage's role in Country A's unemployment rise unclear.

Country B serves as a natural control group. Since B experienced nearly identical unemployment growth without a minimum wage change, a common external factor likely drove most of both countries' increases. This makes isolating the minimum wage's effect extremely difficult. Choice B assumes a precise causal attribution (exactly 0.1%) that the data cannot support. Choice C overreaches in the opposite direction — the data doesn't prove zero effect either. Choice D contradicts the passage's explicit statement that the economies are identical.