IMAT - International Medical Admissions Critical Thinking and Arguments Questions and Answers — Questions and Answers
Question 1: A study found that regular consumption of dark chocolate is associated with a lower risk of heart disease. The researchers concluded that a specific antioxidant found in dark chocolate is responsible for this effect. Which of the following, if true, would most seriously weaken this conclusion?
- Participants in the study who ate dark chocolate regularly also reported exercising more frequently than those who did not. (Correct answer)
- The study was funded by a company that produces dark chocolate.
- Milk chocolate, which has lower levels of the antioxidant, was not associated with a lower risk of heart disease.
- The antioxidant in question can also be found in other foods, such as berries and green tea.
Correct answer: Participants in the study who ate dark chocolate regularly also reported exercising more frequently than those who did not.
The conclusion attributes the lower risk of heart disease solely to the antioxidant in dark chocolate. However, if the dark chocolate consumers also exercised more, this presents a confounding variable. Regular exercise is a well-known factor for reducing the risk of heart disease. Therefore, it's possible that the observed effect is due to exercise, not the antioxidant, or a combination of both. This possibility directly weakens the causal link asserted in the conclusion.
Question 2: Argument: 'To be a successful doctor, one must have excellent scientific knowledge. Dr. Evans has published numerous groundbreaking scientific papers. Therefore, Dr. Evans is a successful doctor.' Which of the following is a necessary assumption for this argument to be logically valid?
- All doctors who have published groundbreaking scientific papers are successful.
- Dr. Evans possesses all other qualities required to be a successful doctor, such as good communication skills.
- Publishing groundbreaking scientific papers is sufficient to demonstrate excellent scientific knowledge. (Correct answer)
- Many successful doctors have not published any scientific papers.
Correct answer: Publishing groundbreaking scientific papers is sufficient to demonstrate excellent scientific knowledge.
The argument moves from the premise 'Dr. Evans has published...' to support the idea that she has 'excellent scientific knowledge'. For the argument to work, the act of publishing groundbreaking papers must be accepted as proof of that knowledge. This is the unstated link, or assumption, that connects the premise to the intermediate conclusion, which then supports the final conclusion.
Question 3: A hospital is facing an increase in patients with a specific vitamin deficiency. The hospital's management states: 'We must increase our stock of vitamin supplements. This is the only way to address the rising number of deficiency cases we are seeing.' Which of the following best describes the flaw in the management's reasoning?
- It fails to consider other potential solutions to the problem.
- It assumes that the vitamin supplements are affordable for the hospital.
- It relies on the unproven assumption that patients will take the supplements.
- It mistakes a potential solution for the only solution. (Correct answer)
Correct answer: It mistakes a potential solution for the only solution.
The flaw in the argument is the assertion that stocking supplements is the 'only way' to address the problem. This is an example of a false dilemma or limiting the options. There could be other effective interventions, such as dietary education programs, providing fortified foods, or investigating the root cause of the deficiency in the community. By presenting their solution as the sole option, they overlook other possibilities.
Question 4: Many people believe that early birds, those who wake up early, are more productive than night owls, those who stay up late. A recent article argues that this is a myth. It states that productivity is not determined by one's sleep schedule but by the quality of sleep and the alignment of one's work schedule with their natural sleep cycle. Which of the following can be drawn as a valid conclusion from the article's argument?
- Night owls can be just as productive as early birds if their work schedules are adapted to their sleep cycles. (Correct answer)
- Everyone would be more productive if they followed their natural sleep cycle.
- Early birds have better quality sleep than night owls.
- Changing one's sleep schedule has no effect on productivity.
Correct answer: Night owls can be just as productive as early birds if their work schedules are adapted to their sleep cycles.
The text argues that productivity depends on sleep quality and matching work to one's natural cycle, not on being an 'early bird'. This directly implies that if a 'night owl' aligns their work with their late-night cycle and gets quality sleep, they can achieve the same level of productivity as an 'early bird' whose schedule is similarly aligned. The other options are too strong or are not directly supported by the text.
Question 5: A pharmaceutical company advertised a new drug, stating: 'In a recent trial, 80% of patients taking our new drug reported a significant reduction in symptoms compared to only 60% of patients taking a placebo.' Which of the following pieces of additional evidence would be most important in evaluating the significance of this claim?
- The total number of participants in the trial. (Correct answer)
- The cost of the new drug compared to the placebo.
- The side effects experienced by patients taking the new drug.
- The long-term effects of the drug after the trial concluded.
Correct answer: The total number of participants in the trial.
While side effects, cost, and long-term effects are all medically important, the statistical significance of the claim itself hinges on the sample size. An 80% vs. 60% difference is much more meaningful and less likely to be due to random chance if the trial involved thousands of participants than if it involved only ten. Without knowing the number of participants, we cannot assess the reliability of the reported percentages.
Question 6: All students in the advanced biology course must have completed an introductory chemistry course. Sarah is a student in the advanced biology course. Therefore, Sarah must have completed an introductory chemistry course. Which of the following arguments has the most similar logical structure to the argument above?
- All professional athletes must train rigorously. Michael is a professional athlete. Therefore, Michael must train rigorously. (Correct answer)
- To enter the museum, you must have a ticket. John has a ticket. Therefore, John can enter the museum.
- Every bird has wings. A bat has wings. Therefore, a bat is a bird.
- If it is raining, the ground will be wet. The ground is wet. Therefore, it must be raining.
Correct answer: All professional athletes must train rigorously. Michael is a professional athlete. Therefore, Michael must train rigorously.
The original argument has the structure: All X have property Y. Z is an X. Therefore, Z has property Y. This is a classic deductive argument. The correct answer choice mirrors this structure perfectly: All professional athletes (X) must train rigorously (Y). Michael (Z) is a professional athlete (X). Therefore, Michael (Z) must train rigorously (Y). The other options represent different logical forms, some of which are flawed.
IMAT - International Medical Admissions Critical Thinking and Arguments Questions and Answers
A study found that regular consumption of dark chocolate is associated with a lower risk of heart disease.
The researchers concluded that a specific antioxidant found in dark chocolate is responsible for this effect.
Which of the following, if true, would most seriously weaken this conclusion?