Logical Reasoning

Health Policy Analyst: A five-year hospital study observed that patients assigned to rooms with large windows overlooking landscaped gardens requested 25 percent less pain medication following surgery than patients whose rooms overlooked brick walls. Therefore, exposure to natural scenery directly accelerates physiological recovery from surgical trauma, reducing the biological need for analgesic drugs.

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

Match each flawed argumentative excerpt on the left with the description on the right that most accurately identifies its primary reasoning vulnerability.

Complete the statement with the appropriate word or phrase to make the argument's conclusion follow logically.

Consider the following argument:

Ecologist: Many urban municipalities are replacing high-pressure sodium streetlights with broad-spectrum white LED lamps to reduce electricity costs. Over the past two years, surrounding agricultural zones near cities adopting LEDs reported a 20 percent decline in the nocturnal pollination of night-blooming crops by moths. Because white LEDs emit substantial short-wavelength blue light, which is known to disorient adult moths and suppress foraging activity, the switch to white LEDs is the direct cause of this agricultural pollination decline.

Statement: The finding that agricultural zones surrounding these cities simultaneously introduced a broad-spectrum chemical treatment targeting nocturnal insect populations, if true, weakens the ecologist's argument.

Marine archaeologists preserving waterlogged wooden artifacts adhere to several strict conservation protocols:

- Any waterlogged artifact recovered from a marine environment that contains iron fasteners undergoes chemical desulfurization before polyethylene glycol (PEG) impregnation.
- A waterlogged artifact is freeze-dried only if it has successfully completed PEG impregnation.
- Every artifact that undergoes chemical desulfurization is treated with an alkaline neutralizing bath.
- No artifact recovered from a marine environment that is treated with an alkaline neutralizing bath exhibits post-drying structural warping.

If the statements above are true, which of the following statements must also be true? (Select all that apply.)

In the Northern Cascade mountain range, any high-elevation forest plot that sustains a breeding population of northern spotted owls contains old-growth Douglas fir trees. Every forest plot containing old-growth Douglas fir trees has a canopy closure rate of at least 70 percent. However, no forest plot with a canopy closure rate of at least 70 percent permits the rapid proliferation of sun-loving invasive thistle species. In last year's ecological survey of the region, Plot K was found to have a rapid proliferation of sun-loving invasive thistle species.

If the statements above are true, which one of the following must also be true on the basis of them?

Under the Orbital Spaceflight Authority's safety regulations, any commercial satellite operator granted a low-Earth orbit constellation license is required to equip every deployed operational unit with an autonomous collision-avoidance thruster. An autonomous collision-avoidance thruster is approved for operational deployment only if it has passed cryogenic propellant validation. Furthermore, no propulsion mechanism that passes cryogenic propellant validation relies on single-phase chemical ignition. Last year, the Orbital Dynamics Consortium was granted a low-Earth orbit constellation license, and several of its proprietary propulsion units relied on single-phase chemical ignition.

If the statements above are true, which one of the following must be true?

Food Safety Inspector: To be certified as artisanal sourdough bread under the regional culinary registry, a bakery must use a naturally fermented sourdough culture rather than commercially packaged baker's yeast. The Old Mill Bakery prepares all of its bread loaves exclusively with a wild sourdough starter that is naturally fermented. Therefore, the bread produced by The Old Mill Bakery will definitely be certified as artisanal sourdough bread by the regional culinary registry.

Which one of the following most accurately describes a flaw in the food safety inspector's reasoning?

A wildlife sanctuary reported a 40 percent decline in the local songbird population over the past two years, coinciding with the arrival of feral cats in the preserve. Because feral cats are known predators of small birds, sanctuary managers concluded that predation by the cats is the direct cause of this population decline.

Which of the following, if true, most seriously weakens the sanctuary managers' argument?

All botanists employed at the state arboretum have specialized certification in rare flora preservation. Anyone who possesses specialized certification in rare flora preservation is authorized to collect plant specimens in the protected nature reserve. Clara is a botanist employed at the state arboretum.

If the statements above are true, which one of the following must also be true?

Forestry Researcher: Alpine birch trees infested with leaf-mining moths suffer significantly less winter frost injury than uninfested birch stands nearby. Because the larvae generate minute amounts of metabolic heat while burrowing inside leaf tissues during late autumn, this thermal output must directly shield the birch trees from extreme freezing temperatures during the subsequent winter months.

Which of the following, if true, most seriously undermines the forestry researcher's conclusion?

Every manuscript in the municipal archive that was created before 1750 is stored in a climate-controlled vault. Any archive document stored in a climate-controlled vault requires written authorization from the head archivist to be accessed. Today, researcher Evelyn was granted access to a municipal archive document without written authorization from the head archivist.

Based on the statements above, which of the following statements must be true? (Select all that apply.)

Match each argument with the fundamental unstated assumption on which its conclusion logically depends.

Every deep-sea research probe deployed into the Hadal zone that operates below 7,000 meters requires a titanium-composite pressure hull. No probe equipped with a titanium-composite pressure hull can utilize standard acoustic telemetry for real-time surface communication. Any probe that cannot utilize standard acoustic telemetry must record its observational telemetry locally onto solid-state optical drives unless it is tethered directly to a fiber-optic surface buoy. Last season, the Mariana Oceanic Survey deployed six autonomous, untethered probes into the Hadal zone, all of which operated at a depth of 8,200 meters throughout their missions. Furthermore, some probes deployed by the survey last season suffered complete failure of their external imaging sensors.

If all the statements above are true, which of the following statements must also be true? (Select all correct statements.)

Transportation Director: Six months after our municipal transit authority installed high-definition surveillance cameras across central bus terminals, reported pickpocketing incidents decreased by 35 percent. Because the cameras were mounted in prominent, well-marked locations, it is clear that potential thieves were deterred by the visible likelihood of being recorded.

Statement: If it is true that transit authorities also doubled the deployment of uniformed foot-patrol officers across the central terminals throughout the same six months, this fact weakens the Transportation Director's argument.

Match each flawed argument excerpt on the left with the description on the right that most accurately identifies its primary reasoning vulnerability.

At the Crestview Municipal Library, every employee who manages the archival collection has completed advanced cataloging training. In addition, no employee who has completed advanced cataloging training is permitted to perform public front-desk duties during morning shifts.

If the statements above are true, which of the following must also be true?

Agricultural Advisor: A regional coffee farming cooperative recently reported that member farms using a newly introduced organic compost experienced a twenty percent decrease in crop-damaging beetle infestations compared to the previous year. Because no other new pest control products were distributed to these farms during that period, the cooperative's directors concluded that the compost itself produces compounds that actively repel these beetles.

Which of the following, if true, most seriously weakens the directors' argument?

Botanist: In order for this rare species of orchid to bloom, it must be kept in an environment with high humidity. The greenhouse housing this specimen has maintained high humidity throughout the entire year. Therefore, this orchid will bloom.

Which one of the following most accurately describes the reasoning flaw in the botanist's argument?

A university library recently replaced all of its older fluorescent ceiling lights with energy-efficient LED fixtures that emit a cooler, bluer spectrum of light. During the semester following the installation, the average number of hours students spent studying in the library each evening increased by thirty percent. The university administration concluded that the cooler light spectrum provided by the LED fixtures directly caused students to study for longer periods. Which one of the following is an assumption on which the university administration's argument depends?