Critical Reasoning: Argument Evaluation

A municipal public transit authority plans to address its operational deficit by installing automated turnstile gates at all underground metro stations and laying off all human ticket inspectors. The authority's financial analysts claim that because the annual maintenance cost of the automated gates will be significantly less than the total annual salaries of the inspectors, implementing this plan is guaranteed to decrease the authority's net operating deficit in its first year. Which of the following would it be most useful to determine in order to evaluate the validity of the financial analysts' conclusion?

Consider the following argument: An agricultural biotechnology firm plans to market a automated seed-analysis device to commercial grain farmers. The firm predicts that launching this device will significantly increase its annual operating profits because the device reduces sample processing time by 50 percent, allowing farmers to test twice as many seeds in a single day without incurring additional labor costs.

Evaluating the following statement: Determining whether commercial grain farmers currently experience a bottleneck in seed testing that restricts their total volume of seed purchases is a relevant test of variance for evaluating the validity of the firm's profit prediction.

A municipal water authority plans to install automated acoustic leak detectors along its primary underground distribution pipeline network. City officials calculate that detecting subterranean micro-leaks early will save millions of gallons of treated water annually, thereby reducing overall water purification and pumping costs by significantly more than the installation and maintenance expense of the sensors. Therefore, city officials conclude that implementing this sensor network will increase the municipal water utility's net annual operating budget surplus.

Which of the following would it be most useful to establish in order to evaluate the validity of the argument?

Consider the following business plan argument:

A commercial bakery plans to replace standard white flour with a newly developed high-fiber wheat flour across all its bread product lines. The bakery's management reasons that because health-conscious consumers are willing to pay a 25% premium for high-fiber products, making this change will significantly boost the company's net profits over the coming year.

Match each evaluation question regarding the argument's validity on the left with the correct variance analysis outcome on the right.

A wildlife conservation agency plans to introduce a native predatory bird, the peregrine falcon, into a coastal metropolitan area to control the rapidly growing population of feral pigeons. Conservationists argue that because feral pigeons make up over 80 percent of the falcon's natural diet in comparable habitats, this introduction will significantly reduce the city's pigeon population without threatening indigenous songbird species.

Which of the following questions would be most useful to evaluate the validity of the conservationists' argument?

To reduce the severity of summer wildfires, a municipal forestry board plans to replace mechanical brush-clearing with controlled goat grazing along park perimeters. Mechanical clearing leaves behind dry, shredded plant residue that remains combustible on the forest floor for several months. In contrast, goats consume underbrush completely, eliminating ground residue. The board concludes that substituting goat grazing for mechanical clearing will significantly decrease the overall intensity of wildfires in these perimeters during the dry season.

Which of the following is an assumption on which the forestry board's argument depends?

A commercial vertical farm located in a high-latitude urban center plans to reduce its energy overhead by replacing half of its indoor electric LED grow lights with a passive fiber-optic system that collects natural sunlight via rooftop lenses and pipes it into cultivate chambers. Management contends that because electricity consumed by artificial lighting accounts for over sixty percent of the farm's monthly operating expenditures, implementing this solar piping system will significantly decrease total monthly operating expenses. Which of the following is an assumption on which management's argument depends?

A municipal transit authority plans to replace station ticket window personnel with automated self-service kiosks in order to reduce station operating expenses. The authority claims that because automated kiosks eliminate the need to pay hourly wages to human ticket agents, implementing this system will successfully decrease the total monthly operational costs of running the transit stations. Which of the following is an assumption on which the transit authority's argument depends?

A municipal agricultural board analyzed crop yields across farms in Region K over the past five years. The board observed that farms using Organic Soil Treatment X produced 20 percent higher crop yields on average than farms using standard synthetic fertilizers. Based on this observation, the board concluded that adopting Organic Soil Treatment X increases agricultural productivity. Consequently, the board recommended that all farms in Region K switch to Organic Soil Treatment X to boost overall regional crop output.

True or False: The argument's reasoning is vulnerable to criticism because it assumes that the higher crop yields observed on farms using Organic Soil Treatment X were caused by the treatment itself, rather than by other pre-existing differences between those farms and farms using synthetic fertilizers.

Consider the following argument: A regional art museum recently replaced all single-use plastic water bottles in its cafeteria with reusable glass bottles. Museum administrators claim that this policy will significantly reduce the cafeteria's overall carbon footprint over the coming year. Evaluate the following statement: The argument depends on the assumption that the energy consumed in manufacturing and repeatedly washing the reusable glass bottles does not produce greenhouse gas emissions that equal or exceed the emissions saved by eliminating the single-use plastic bottles.

A regional healthcare network analyzed performance data from its twenty member hospitals over a two-year period. The network found that the five hospitals that voluntarily installed automated self-service check-in kiosks experienced a 20 percent decrease in average emergency room wait times. Based on this observation, the executive board concluded that installing these kiosks across the remaining fifteen hospitals will lead to a comparable decrease in patient wait times across the entire network.

The executive board's reasoning is most vulnerable to criticism on the grounds that it

An international airline recently decided to replace heavy printed inflight magazines with digital versions accessible via passengers' personal mobile devices. Management claims that removing the printed magazines will significantly reduce the aircraft's weight and overall fuel consumption during flights. Therefore, management concludes that the airline's total operating expenses will decrease starting next month. Which of the following is an assumption on which the management's conclusion depends?

Consider the following argument: A regional courier company plans to replace its gasoline-powered delivery vans with electric vehicles in order to lower its annual fuel expenditures. The company's director claims that making this fleet replacement will increase the company's net annual profit.

True or False: The director's argument depends on the unstated assumption that the cost savings from lower fuel expenditures will not be exceeded by the costs of acquiring and maintaining the electric vehicles.

The municipal electric utility of a small district recently announced a plan to replace its natural gas electricity supply with solar power. The utility directors argue that because generating electricity from solar power currently costs significantly less per megawatt-hour than generating it from natural gas, adopting solar power will reduce the total monthly electricity bills of local residents. Which of the following is an assumption on which the utility directors' argument depends?

Passage: A commercial airline recently observed that flight routes equipped with newly upgraded in-flight entertainment systems recorded a 15 percent higher passenger satisfaction rating over a six-month trial period than routes retaining standard systems. The airline's management concluded that installing these upgraded entertainment systems was the direct cause of the higher passenger satisfaction, and therefore ordered the immediate installation of the systems across all remaining aircraft to boost overall customer approval.

Statement: The management's argument is vulnerable to criticism because it assumes that an observed correlation between upgraded entertainment systems and higher passenger satisfaction proves a direct causal relationship, without ruling out alternative explanations for the higher ratings on those specific routes.

A municipal water authority recently installed smart digital water meters across a high-income residential neighborhood in District North. Over the six months following the installation, average monthly household water consumption in District North declined by 12 percent compared to the preceding year. Satisfied with these results, the authority's director concluded that installing smart digital water meters across all municipal districts will lead to a citywide reduction in household water usage. Which of the following points to a flaw in the director's reasoning?

A specialty pharmaceutical company plans to transition the synthesis of its primary active ingredient from traditional batch processing to continuous flow manufacturing. Management claims that this operational shift will lower the overall production cost per unit by at least 20 percent. This claim is grounded in the observation that continuous flow processing completely eliminates the multi-day downtime currently required between batches for vessel sterilisation and quality re-validation.

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

Consider the following argument: A deep-sea oceanographic research institute plans to replace its fleet of battery-powered autonomous gliders with thermal-gradient gliders for long-term polar climate monitoring. The battery-powered gliders require frequent, expensive ship-based retrieval trips to replace depleted batteries. Because thermal-gradient gliders harvest energy from oceanic temperature differences, they can remain deployed indefinitely, thereby eliminating retrieval trips. The institute concludes that this transition will significantly lower its total operating cost per oceanographic data point collected over a five-year period.

Statement: For the institute's conclusion to hold, it must be assumed that the capital and maintenance costs unique to operating thermal-gradient gliders over five years will not exceed the financial savings achieved by eliminating ship-based battery replacement trips.

Consider the following argument: An agricultural technology firm has developed a novel bio-inoculant containing engineered rhizobacteria designed to increase wheat root depth, thereby improving crop drought tolerance. Field trials conducted exclusively in sandy loam soils demonstrated a 25 percent increase in wheat grain yields under severe drought conditions. Based on these trial results, the firm concludes that commercial application of this bio-inoculant across all major wheat-growing regions will reliably protect wheat yields against severe droughts.

Statement: The argument relies on the unstated assumption that the rhizobacteria bio-inoculant will achieve similar root-depth enhancements in non-sandy soil types typical of other major wheat-growing regions.

Consider the following argument: Urban atmospheric pollution accelerates the decay of historic stained-glass windows through chemical corrosion. To protect a landmark cathedral's 14th-century windows, conservators propose installing protective secondary glazing panels on the exterior facade. Because these panels block airborne sulfur compounds and regulate surface humidity, conservators conclude that this intervention will significantly decrease the overall rate of deterioration experienced by the historic glass over the next decade.

True or False: The argument relies on the unstated assumption that the physical installation of the secondary glazing panels will not introduce mechanical damage or structural strain to the historic glass that offsets the reduction in chemical deterioration.