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GMAT Club Legend
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A recent study of college students shows that, contrary to [#permalink]
 15 Oct 2004, 14:50
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A recent study of college students shows that, contrary to predicted results, special nutritional planning does not positively affect students’ grades. Sixty students, half of whom were given a nutritionally balanced diet, had grades no higher than did those students who were not placed on the diet plan.
Which of the following, if true, is most useful in determining the accuracy of the study described above?
A) Performance of business executives was shown to improve drastically after major alterations were made in their diets.
B) Honors students, after altering their diets, maintained that they did not change their study habits.
C) Students who participated in various fitness regimens found that their grades improved appreciably after they altered their exercise habits.
D) High school students who previously had low grades found that after they altered their diets, their grades improved dramatically.
E) All of the college students who volunteered for the study were either in their first or second year of college.
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Best Regards,
Paul
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Manager
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E???? Very unsure 
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VP
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this is tough!
I will go with C. It could have happened that other students (minus 60) took physical fitness classes and raised their grades to those of 60 students (on balanced diet)
weird though!
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SVP
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I believe it is (B).
Only (B) connects the habits in study and habits in diets. All other choices talk about students or executives in general . They dont talk about students who participated in the study. Only (B) talks about students who participated in the study.
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I will go for (B) Sure.
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Director
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I shortlisted B and E. E because it identifies the sample space used for the study and since the sample space is the appropriate group, the study should be accurate.
B because, it makes reference to a potentially superior group (honor students) and identifies that even that group had no impact because of the diet. But makes me ask this question, if it doesnt impact 'honor students' does it mean that it can be applicable to the other student group. Hmm...need not be. Also, 'honor students' should do well anyway irrespective of diet. Afterall they are 'honor students'!!
Hence E.
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GMAT Club Legend
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This one is from PR CAT so for those who say that PR verbal is easy, not always  OA is D and I picked B at first but I agree with the answer although the OE is not quite good. The question is about how to evaluate the accuracy of the given claims; that the diet does not improve students' grades. D directly contradicts the claim by saying that the diet DID improve students' grades. Therefore, it will allow us to conclude that NO, the claim is unaccurate. B is out of scope for we are not interested in honor students in particular. In E, the claim did not segregate between first and second year students so we don't need to know specific segregation of sample. This is actually out of scope. C is out of scope because exercise will not allow us to evaluate the link between good grades and diets.
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Best Regards,
Paul
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I got D. I thought this question is straight forward. May be it was accidently I arrived at the answer.
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Manager
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friends... that´s a tough one ... anyone has a grasp about the OA ?
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Senior Manager
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domleon wrote: friends... that´s a tough one ... anyone has a grasp about the OA ? I got D as well. It's straight forward. What the question is asking you to find a situation that could question the results of the survey, D clearly does this by showing the opposite actually occured. If the opposite did not occur then the argument would not be called into question and accepted as true. The best way of approaching this I think is to find the conclusion and select the answer that attacks it by proving the opposite. The other answers are either out of scope e.g. A or have no direct bearing on the argument.
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Director
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It has to be D.
Its the only one the directly confronts the conclusion in the argument, and hence the most relevant.
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D
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Check out the new Career Forum
http://gmatclub.com/forum/133
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Vavali, I didn't get ur explanation.. They are asking you for the statement that is more accurate to support the argument thats what i understood from the question :S
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Manager
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I think this is pretty straight forward with D being the answer. If anything you can arrive to the answer by a process of elimination A - Business executives vs college student. performance vs grades - different animal alltogether B - Diets vs study habits when the study is comparing diets to grades - bad comparison C - Tricky but keep in mind we are talking about nutritional habits (i.e. diets) NOT exercise habits D - Low grades - improved diets - better grades --- similar to the college students study. This is the only relevant point of comparison where one can make a determination (in either direction, its irellevant in this case) as to how good the study of diets vs grades is. E - the students were first or second years - Oh yeah? So what
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Manager
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This is gotta D. What's the OA, Paul?
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