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Question 1
The city of Portmund has a large taxi industry. Generally, the availability of taxis tends to increase at × when the demand for their service is higher. But according to a survey of driver hours and revenues, when demand for taxis is highest, the number of taxis in service tends to be far below its peak. One researcher has suggested that this is in part because many taxi drivers choose not to work when rain or snow makes for hazardous road conditions.
Which of the following, if true, would most contribute to strengthening the researcher's explanation?
Your Answer: Option(s)
Correct Answer: Option(s) C
Rationale
Portmund residents who would ordinarily drive tend to prefer transportation by taxi during heavy snowstorms.
This statement strengthens the researcher's explanation by indicating that even when demand for taxis increases during adverse weather, the actual number of taxis available may still be low due to drivers opting not to work. If more residents rely on taxis in bad weather, the existing supply would struggle to meet this higher demand, highlighting the disconnect between demand and supply.
A) A majority of Portmund businesses shut down during heavy snowstorms.
This choice does not directly relate to the taxi industry's dynamics. While it may reflect overall economic activity during snowstorms, it does not provide insight into why taxi drivers might choose not to work during such conditions or how this impacts taxi availability.
B) Most Portmund taxi drivers own their vehicles.
This statement suggests a level of independence among taxi drivers, but it does not address their decision-making during inclement weather. Ownership does not inherently explain why drivers would elect not to work when conditions are hazardous, failing to strengthen the researcher's claim.
D) Portmund's average annual number of rainy and snowy days is higher than the national average.
While this fact highlights the frequency of adverse weather conditions, it does not offer an explanation for drivers' behavior during these ×. It merely contextualizes the environment without linking it to driver decisions about working during inclement weather.
E) At most ×, the most common destination for Portmund taxi passengers is the local airport.
This choice provides information about typical passenger behavior but does not address the factors influencing taxi driver availability during poor weather. It fails to connect with the core issue of driver decisions in the face of hazardous conditions.
Conclusion
The researcher's explanation is bolstered significantly by the assertion that residents who would normally drive prefer taxis during heavy snowstorms, indicating heightened demand. This preference juxtaposed with a low driver turnout during such conditions illustrates the critical mismatch between supply and demand, reinforcing the idea that adverse weather conditions discourage driver participation in the taxi industry.
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Question 2
For decades, government agencies in Country Y have been trying to reduce the population's consumption of salt. In the 1980s, the government issued consumer guidelines including advice against excess salt and shortly thereafter called on the food industry to voluntarily reduce the relatively high levels of salt in processed foods, which the food industry did to some extent. However, data from a 2008 national study showed that men were, on average, consuming 45 percent more salt than men did in the early 1970s, and women, 69 percent more.
Which of the following would, if true, most help to account for the plan's failure to achieve the desired results?
Your Answer: Option(s)
Correct Answer: Option(s) C
Rationale
In 2008, processed foods were a significantly higher percentage of people's daily food consumption than in the 1980s.
The increase in the proportion of processed foods in people's diets since the 1980s likely contributed to the rising salt consumption, even in the face of government efforts to reduce salt levels. If processed foods, which often contain higher salt levels, make up a larger portion of daily intake, it would explain why salt consumption increased despite regulatory measures.
A) The population increased significantly between the 1980s and 2008.
While a population increase may suggest a higher overall consumption of food, it does not directly account for the failure to reduce salt consumption. The issue lies in the dietary habits and food choices of individuals rather than the sheer number of people consuming salt.
B) Makers of processed foods have created several new products since the 1980s.
The introduction of new processed food products might not necessarily lead to increased salt consumption. If these new products are lower in salt or if consumers are choosing healthier options, this would not help explain the rising salt intake.
D) In 2008, more people were aware of the dangers of consuming excess salt than prior to the 1980s.
Increased awareness of health risks associated with salt does not correlate with reduced consumption. If people are more aware but still consuming more salt, it suggests that awareness alone is not effective in changing dietary behaviors.
E) On average, the consumption of excess salt has more adverse effects on men's health than it has on women's health.
Although salt consumption may affect men and women differently, this fact does not address the overall increase in consumption. The differential health impacts do not provide an explanation for why the population as a whole consumed more salt despite health campaigns.
Conclusion
The significant increase in the percentage of processed foods in people's diets from the 1980s to 2008 is a key factor in the failure to reduce salt consumption. This trend likely outweighed the effects of government guidelines and voluntary reductions by the food industry, leading to higher overall salt intake. Understanding dietary habits and food sources is crucial in addressing public health initiatives aimed at reducing salt consumption.
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Question 3
Verenia is a remote, undeveloped upland area whose streams and rivers are neither dammed nor used for crop irrigation. Measurement of water flow in those streams and rivers shows a substantial increase over the last 50 years, indicating an increase in precipitation. However, even though rivers in the area are extremely prone to flooding, there has been no comparable increase in either the frequency or the severity of flooding there.
Which of the following, if true, most helps to resolve the discrepancy between precipitation and flooding in Verenia?
Your Answer: Option(s)
Correct Answer: Option(s) A
Rationale
Nearly all of the increase in precipitation in Verenia has occurred in the hottest and driest months of the year.
This statement helps explain the discrepancy between increased precipitation and unchanged flooding patterns. If most precipitation occurs during the hottest and driest months, it may evaporate quickly or be absorbed by the environment rather than contributing to flooding.
A) Nearly all of the increase in precipitation in Verenia has occurred in the hottest and driest months of the year.
This choice directly addresses the issue by suggesting that the timing of precipitation affects its impact. If rainfall occurs when temperatures are high, much of it may evaporate before contributing to river flow, leading to little or no increase in flooding despite higher precipitation levels.
B) After descending from Verenia, the rivers flow into a region in which crop irrigation has increased significantly over the last 50 years.
While this might suggest that water is being redirected or used, it does not resolve the discrepancy between increased precipitation and the lack of flooding in Verenia itself. It fails to explain why flooding patterns in Verenia have remained stable despite higher water flow.
C) Many scientists are predicting that the increase in precipitation in Verenia will cease.
This statement does not address the current situation regarding flooding and precipitation. Predictions about future weather patterns do not help clarify the observed discrepancy between the increase in rainfall and the unchanged flooding frequency and severity.
D) Because Verenia has few inhabitants, flooding there seldom leads to loss of human life.
This choice discusses the consequences of flooding rather than the relationship between precipitation and flooding itself. It does not explain why, despite increased precipitation, flooding has not become more frequent or severe.
E) Very few of the streams and rivers in Verenia are suitable for damming.
While this may describe the geography of Verenia, it does not resolve the apparent contradiction. The inability to dam rivers does not explain why increased precipitation has not resulted in more flooding events.
Conclusion
The increase in precipitation in Verenia, occurring primarily during the hottest months, likely evaporates or is absorbed before causing flooding. This understanding clarifies why the flooding patterns have remained stable despite the rise in water flow, emphasizing the importance of timing in precipitation's impact on flooding.
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Question 4
Coastal Rail provides commuters with an alternative to driving between Seaside County's coastal towns. However, the number of people who ride Coastal Rail trains on Fridays after 4 p.m. is not sufficient to cover the expenses of running those trains. Coastal Rail's management has nonetheless rejected as financially unsound a plan to discontinue Friday evening service.
Which of the following, if true, provides Coastal Rail's management with the best justification for its decision?
Your Answer: Option(s)
Correct Answer: Option(s) E
Rationale
Expenditures, such as that for rail maintenance, will not be reduced by discontinuing service after 4 p.m. on Fridays.
This justification supports Coastal Rail's decision to maintain Friday evening service despite insufficient ridership, as it indicates that the costs incurred will remain unchanged whether or not the trains are operational during that time.
A) Several of Coastal Rail's top managers live in Seaside County's coastal towns.
While this fact may highlight a personal interest in maintaining service, it does not provide a financial rationale for why the service should continue if it is not covering its expenses. Managerial convenience does not justify the ongoing operational costs.
B) More passengers use Coastal Rail between noon and 4 p.m. on Fridays than during those hours on other days of the week.
This information indicates a peak in ridership during certain hours but does not directly support the decision to continue service after 4 p.m. if that service remains financially unviable. It highlights usage patterns rather than justifying costs.
C) Most passengers who use the service after 4 p.m. on a weekday are returning home after using Coastal Rail to get to work that morning.
This suggests that some evening riders are commuting home after working hours, but it does not address the financial implications of maintaining the service. If the evening ridership still does not cover costs, this pattern alone does not justify service continuation.
D) The number of passengers using Coastal Rail after 4 p.m. has been declining on weekdays other than Friday.
This indicates a broader trend of diminishing ridership, which could reinforce the argument for discontinuing service. It does not support the decision to keep Friday service running, given the financial losses associated with low patronage.
Conclusion
The best justification for maintaining Friday evening service lies in the fact that discontinuing it would not reduce expenditures related to rail maintenance and other fixed costs. By recognizing that operational expenses will persist regardless of ridership levels, Coastal Rail's management can rationalize their choice to keep the service available, potentially hoping for future increases in demand or ridership.
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Question 5
Archaeologists found a large forest mound that showed evidence of use by an ancient society about 1,000 years ago, including compacted soil indicating trails or roads, and small copper bells and jewelry in test excavations. Some of the archaeologists concluded that the mound was built and regularly used by members of the society as part of a permanent village, something they were known to have done at nearby sites. Others concluded that the mound was a natural feature visited intermittently for rituals.
Assuming that one of the two conclusions cited above is correct, which of the following, if discovered at the site, would most help determine which is the correct one?
Your Answer: Option(s)
Correct Answer: Option(s) D
Rationale
Traces of hearths on the mound showing sustained use for baking around a thousand years ago would most help determine the correct conclusion.
The presence of hearths indicates continuous and regular use of the mound for cooking, supporting the idea that it functioned as part of a permanent village rather than as a temporary ritual site. This evidence directly suggests that the mound was not only visited but actively utilized for daily living by the society.
A) Residues of human food at the top of the mound
While human food residues could indicate some level of human activity, they do not necessarily prove that the mound was used as a permanent site. The food could have been deposited during intermittent visits, making this evidence ambiguous regarding the nature of the site's use.
B) Evidence that the copper bells were originally attached to clothing items
Finding evidence of the bells being part of clothing would suggest some cultural practices, but it does not provide definitive proof about the nature of the mound's use. The bells could have been used in both permanent or temporary settings, thus failing to clarify the conclusions drawn.
C) Fragments of several large and strong baskets dating from around a thousand years ago
While these basket fragments could indicate some form of storage or transport, they do not directly imply regular habitation or sustained use of the mound. Their presence alone would not determine whether the site was part of a permanent village or used for sporadic rituals.
E) One-thousand-year-old trails connecting the mound to sites several kilometers away known to have been permanent villages
Although these trails suggest connectivity to other villages, they do not confirm that the mound itself was a permanent feature. The trails could have been used for various purposes, including temporary visitation, without indicating the nature of the mound's use.
Conclusion
To discern whether the mound served as a permanent village or a temporary ritual site, the discovery of traces of hearths would provide the strongest evidence. This finding supports the argument for regular and sustained use, aligning with the characteristics of a permanent settlement. Other choices, while informative, lack the direct connection to continuous habitation necessary to reach a conclusive determination.
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