Bunuel
More gym memberships are bought in the town of Schwartz than in the town of Talsberg. Therefore, the citizens of Schwartz exercise more frequently than do the citizens of Talsberg.
Each of the following, if true, weakens the conclusion above EXCEPT:
A. Schwartz has a larger population than Talsberg does.
B. Most citizens of Talsberg work in Schwartz and have memberships in gyms there.
C. The average price of a gym membership is lower in Schwartz than it is in Talsberg.
D. A large, free community gym open to all is available to the citizens of Talsberg.
E. The average citizen of Schwartz spends less time at the gym per week than does the average citizen of Talsberg.
Experts' Global Explanation: Mind-map: More gym memberships are bought in town S than in town T à town S citizens exercise more frequently than town T citizens (conclusion)
Missing-link: Between more gym memberships being bought in town S than in town T and the conclusion that town S citizens exercise more frequently than town T citizens
Expectation from the correct answer choice: To NOT weaken the conclusion that town S citizens exercise more frequently than town T citizens
A. Trap. By suggesting that Schwartz’s population is greater than Talsberg’s population, this answer choice
explains why more gym memberships are bought in Schwartz than in Talsberg and indicates the possibility that
Schwartz’s citizens may not necessarily be exercising more frequently than the citizens of Talsberg; such a possibility weakens the conclusion. Because this answer choice weakens the conclusion, this answer choice is incorrect.
B. By suggesting that Talsberg citizens have gym memberships in Schwartz gyms, this answer choice indicates that the
gym membership numbers in both the towns are not accurate and
casts doubt on any inference based on the numbers; such a doubt weakens the conclusion. Because this answer choice weakens the conclusion, this answer choice is incorrect.
C.
Correct. Lower average price of gym membership makes
no definite suggestion about the frequency of exercising; it is possible that Schwartz’s
lower gym membership prices indicate lower demand for gyms, suggesting that Schwartz’s citizens may not necessarily be exercising more frequently than the citizens of Talsberg, thus weakening the conclusion; on the other hand, Schwartz’s
lower gym membership prices may indicate competition among gyms, suggesting higher demand for gyms and that Schwartz’s citizens may be exercising more frequently than the citizens of Talsberg, thus strengthening the conclusion. Overall, this
answer choice is just additional information and does not definitely weaken the conclusion. Because this answer choice weakens the conclusion, this answer choice is correct.
D. By suggesting that a free gym open to all is available in Talsberg, this answer choice indicates that the citizens of Talsberg may not need gym memberships, thus explaining
why more gym memberships are bought in Schwartz than in Talsberg and indicating the possibility that
Schwartz’s citizens may not necessarily be exercising more frequently than the citizens of Talsberg; such a possibility weakens the conclusion. Because this answer choice weakens the conclusion, this answer choice is incorrect.
E. Trap. By suggesting that, on average, the citizens of Schwartz spend less time per week at the gym than the citizens of Talsberg, this answer choice
casts doubt on whether Schwartz citizens exercise more frequently than Talsberg citizens; such a doubt weakens the conclusion. Because this answer choice weakens the conclusion, this answer choice is incorrect.
C is the best choice.