undermines the conclusion

This topic has expert replies
Master | Next Rank: 500 Posts
Posts: 185
Joined: Thu Feb 04, 2010 3:06 am
Thanked: 6 times

undermines the conclusion

by gmatnmein2010 » Fri Feb 05, 2010 9:14 pm
It is proposed to allow the sale, without prescription, of a medication that physicians currently prescribe to treat the common ear inflammation called "swimmer's ear." The principal objection is that most people lack the expertise for proper self-diagnosis and might not seek medical help for more serious conditions in the mistaken belief that they have swimmer's ear. Yet in a recent study, of 1,000 people who suspected that they had swimmer's ear, 84 percent had made a correct diagnosis - a slightly better accuracy rate than physicians have in diagnosing swimmer's ear. Thus, clearly, most people can diagnose swimmer's ear in themselves without ever having to consult a physician.

Which one of the following, if true, most undermines the conclusion?

A) Case in which swimmer's ear progresses to more serious infections are very rare.

B) Most of those who suspected incorrectly that they had swimmer's ear also believed that they had other ailments that in fact they did not have.

C) Most of the people who diagnosed themselves correctly had been treated by a physician for a prior occurrence of swimmer's ear.

D) Physicians who specialize in ear diseases are generally able to provide more accurate diagnoses than those provided by general practitioners.

E) For many people who develop swimmer's ear, the condition disappears without medical or pharmaceutical intervention.
Source: — Critical Reasoning |

User avatar
Legendary Member
Posts: 1560
Joined: Tue Nov 17, 2009 2:38 am
Thanked: 137 times
Followed by:5 members

by thephoenix » Fri Feb 05, 2010 9:22 pm
A) Case in which swimmer's ear progresses to more serious infections are very rare. - Really, who cares?

B) Most of those who suspected incorrectly that they had swimmer's ear also believed that they had other ailments that in fact they did not have. Ok, so it talks about the suspicion of people but leads us to other ailments. Will leave it as a weak contender

C) Most of the people who diagnosed themselves correctly had been treated by a physician for a prior occurrence of swimmer's ear. - Aha, this indicates bias - What if the people already new they had swimmers ear. So basically the sample is kinda self selected. Strong Contender

D) Physicians who specialize in ear diseases are generally able to provide more accurate diagnoses than those provided by general practitioners. - Totally out of scope

E) For many people who develop swimmer's ear, the condition disappears without medical or pharmaceutical intervention.
Totally out of scope

So IMO ans is C

Master | Next Rank: 500 Posts
Posts: 185
Joined: Thu Feb 04, 2010 3:06 am
Thanked: 6 times

by gmatnmein2010 » Fri Feb 05, 2010 11:42 pm
OA is C

User avatar
Legendary Member
Posts: 777
Joined: Fri Jan 01, 2010 4:02 am
Location: Mumbai, India
Thanked: 117 times
Followed by:47 members

by komal » Sat Feb 06, 2010 12:43 am
gmatnmein2010 wrote:It is proposed to allow the sale, without prescription, of a medication that physicians currently prescribe to treat the common ear inflammation called "swimmer's ear." The principal objection is that most people lack the expertise for proper self-diagnosis and might not seek medical help for more serious conditions in the mistaken belief that they have swimmer's ear. Yet in a recent study, of 1,000 people who suspected that they had swimmer's ear, 84 percent had made a correct diagnosis - a slightly better accuracy rate than physicians have in diagnosing swimmer's ear. Thus, clearly, most people can diagnose swimmer's ear in themselves without ever having to consult a physician.

Which one of the following, if true, most undermines the conclusion?

Conclusion : Most ppl can diagnose swimmer's ear in themselves without ever having to consult a physician

The author has come to the above conclusion (most ppl) by sampling few ppl (1000 ppl)
We can weaken the argument by showing some kind of disparity in the data/characteristics of the group sampled.


A) Case in which swimmer's ear progresses to more serious infections are very rare.
Incorrect : This does not help in weakening the argument in any way.

B) Most of those who suspected incorrectly that they had swimmer's ear also believed that they had other ailments that in fact they did not have.
Incorrect : Other ailments is clearly irrelevant to the scope of the argument.

C) Most of the people who diagnosed themselves correctly had been treated by a physician for a prior occurrence of swimmer's ear.
Correct : Weakens the argument by showing that most ppl who diagnosed themselves correctly had previously been treated by a physician and hence they had knew about symptoms of swimmer's ear.

D) Physicians who specialize in ear diseases are generally able to provide more accurate diagnoses than those provided by general practitioners.
Incorrect : General Practitioners v/s Ear Specialists is out of scope

E) For many people who develop swimmer's ear, the condition disappears without medical or pharmaceutical intervention.
Incorrect : Issue is not about treating swimmer's ear, issue is about diagnosing swimmer's ear. Eliminated.
Hope this helps : )

Master | Next Rank: 500 Posts
Posts: 140
Joined: Fri Feb 05, 2010 2:43 pm
Thanked: 3 times
GMAT Score:720

by analyst218 » Wed Feb 17, 2010 3:57 pm
i reasoned in the exact same way as komal did.
C