Critical Reasoning

prachich1987 wrote:The OA is A.

prachich1987 wrote:Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness.Dry eyes were more frequently experienced by customers who wore contact lenses than by customers who did not wear contact lenses.The pharmacist concluded that wearing contact lenses, by itself ,can cause wearers to have dry eyes.

Which one of the following if true most seriously undermines pharmacist's conclusion?

A) An inherited condition can cause both weak eyesight and dry eyes.
This indeed gives us a diff reason frm contact lenses whch can cause dry eyes. hence destroys the pharmacists conlcusion tht dry eyes are caused only by contact lenses.
B) Physical exertion causes dry eyes in many people who wear contact lenses.
This in turn confirms the pharmacists belief that contact lenses are the reason for dry eyes. (lenses cause physical exertion)
C) Most people who have dry eyes do not wear contact lenses.
Use of most here, not conclusive enough. other people wth dry eyes may wear lenses.
D) Most people who wear contact lenses do not have dry eyes.
Again most here, according to the passage there are people who do have dry eyes and wear contact lenses.
E) Both weak vision and dry eyes cause headache.
out of scope

OA : a

rohu27 wrote:

prachich1987 wrote:Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness.Dry eyes were more frequently experienced by customers who wore contact lenses than by customers who did not wear contact lenses.The pharmacist concluded that wearing contact lenses, by itself ,can cause wearers to have dry eyes.

Which one of the following if true most seriously undermines pharmacist's conclusion?

A) An inherited condition can cause both weak eyesight and dry eyes.
This indeed gives us a diff reason frm contact lenses whch can cause dry eyes. hence destroys the pharmacists conlcusion tht dry eyes are caused only by contact lenses.
B) Physical exertion causes dry eyes in many people who wear contact lenses.
This in turn confirms the pharmacists belief that contact lenses are the reason for dry eyes. (lenses cause physical exertion)
C) Most people who have dry eyes do not wear contact lenses.
Use of most here, not conclusive enough. other people wth dry eyes may wear lenses.
D) Most people who wear contact lenses do not have dry eyes.
Again most here, according to the passage there are people who do have dry eyes and wear contact lenses.
E) Both weak vision and dry eyes cause headache.
out of scope

OA : a

prachich1987 wrote:Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness.Dry eyes were more frequently experienced by customers who wore contact lenses than by customers who did not wear contact lenses.The pharmacist concluded that wearing contact lenses, by itself ,can cause wearers to have dry eyes.

Which one of the following if true most seriously undermines pharmacist's conclusion?

OA : after some discussion

Also, we have no idea whether the people in the study exherted themselves physically

mundasingh123 wrote:Hi GmatGuruNY,
Thanks for the Help.But i have a doubt regarding Choice A

Also, we have no idea whether the people in the study exherted themselves physically

Similarly How can we relate weak eyesight to contacts.
People could wear contacts for cosmetic purposes as well and not solely because they have weak eyesight.And the people mentioned in the survey could be wearing lenses for cosmetic reasons.

Doesnt the Many word in choice be pair well with the Can Cause Dry eyes in the conclusion
Thanks
Gurvinder

GMATGuruNY wrote:

mundasingh123 wrote:Hi GmatGuruNY,
Thanks for the Help.But i have a doubt regarding Choice A

Also, we have no idea whether the people in the study exherted themselves physically

Similarly How can we relate weak eyesight to contacts.
People could wear contacts for cosmetic purposes as well and not solely because they have weak eyesight.And the people mentioned in the survey could be wearing lenses for cosmetic reasons.

Doesnt the Many word in choice be pair well with the Can Cause Dry eyes in the conclusion
Thanks
Gurvinder

Perhaps I'm misinformed, but I think that the percentage of people who wear contacts solely for cosmetic purposes is very, very small. I would suspect that 99.99% of those who wear contacts do so in order to see better. Thus, we can reasonably assume that the contact wearers in the study have weak eyesight.

We cannot reasonably assume, however, that the contact wearers in the study physically exerted themselves. While the wearing of contacts is likely associated with weak eyesight (answer choice A), it is not necessarily associated with physical activity (answer choice B). Thus, A is the better answer choice.

mundasingh123 wrote:

GMATGuruNY wrote:

mundasingh123 wrote:Hi GmatGuruNY,
Thanks for the Help.But i have a doubt regarding Choice A

Also, we have no idea whether the people in the study exherted themselves physically

Similarly How can we relate weak eyesight to contacts.
People could wear contacts for cosmetic purposes as well and not solely because they have weak eyesight.And the people mentioned in the survey could be wearing lenses for cosmetic reasons.

Doesnt the Many word in choice be pair well with the Can Cause Dry eyes in the conclusion
Thanks
Gurvinder

Perhaps I'm misinformed, but I think that the percentage of people who wear contacts solely for cosmetic purposes is very, very small. I would suspect that 99.99% of those who wear contacts do so in order to see better. Thus, we can reasonably assume that the contact wearers in the study have weak eyesight.

We cannot reasonably assume, however, that the contact wearers in the study physically exerted themselves. While the wearing of contacts is likely associated with weak eyesight (answer choice A), it is not necessarily associated with physical activity (answer choice B). Thus, A is the better answer choice.

Hi GmatGuruNY, 1 More question.The stimulus doesnt mention weak eyesight and Option A brings in a new Concept of weak eyesight and doesnt not explicitly say that people with weak eyesight wear contact lens. So arent we bringing in outside Information to make the link between Contacts and Weak Eyesight.Thanks