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# A recent study of college students shows that, contrary to

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Manager
Joined: 01 Aug 2008
Posts: 105
A recent study of college students shows that, contrary to [#permalink]

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13 Jun 2009, 08:16
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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?

Performance of business executives was shown to improve drastically after major alterations were made in their diets.

Honors students, after altering their diets, maintained that they did not change their study habits.

Students who participated in various fitness regimens found that their grades improved appreciably after they altered their exercise habits.

High school students who previously had low grades found that after they altered their diets, their grades improved dramatically.

All of the college students who volunteered for the study were either in their first or second year of college.

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Director
Joined: 27 Jun 2008
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WE 1: Investment Banking - 6yrs
Re: special nutritional planning [#permalink]

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13 Jun 2009, 09:48
E?
Manager
Joined: 05 Apr 2007
Posts: 234
Re: special nutritional planning [#permalink]

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13 Jun 2009, 11:08
The argument talks about the effect of nutritional values on the grades...D is the only choice which talks about both grades and nutritional values....Various interpretations can be given of the same performance of the original group of 60 people mentioned in the argument....For example there grades may already be very high and further hike was not possible......So IMO D is the answer....
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Director
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Re: special nutritional planning [#permalink]

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13 Jun 2009, 22:53
D only seems to refer to the context.
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Manager
Joined: 01 Aug 2008
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Re: special nutritional planning [#permalink]

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14 Jun 2009, 01:59
mbaMission wrote:
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?

Performance of business executives was shown to improve drastically after major alterations were made in their diets.

Honors students, after altering their diets, maintained that they did not change their study habits.

Students who participated in various fitness regimens found that their grades improved appreciably after they altered their exercise habits.

High school students who previously had low grades found that after they altered their diets, their grades improved dramatically.

All of the college students who volunteered for the study were either in their first or second year of college.

OA: D
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Manager
Joined: 12 Jul 2009
Posts: 51
Re: special nutritional planning [#permalink]

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25 Jul 2009, 12:27
my reasoning..

On paraphrasing, the reflex would be to verify if the study was conducted correctly.
But no choice except B does that, which is out of scope as it talks about honors students, while the study was conducted on college students.
Hence, checking out other options...
Choice D disagrees with the study by asserting that diet does alter grades based on a study on high school 'students'. This helps in determining the accuracy(lower) of the study. Also, this is not out of scope because the q stem generalizes the diet effects on student's grades in general.
Hence D, the best option.
Director
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Re: special nutritional planning [#permalink]

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25 Jul 2009, 12:49
Why B is wrong?

I feel B is stronger than D.
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Manager
Joined: 12 Jul 2009
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Re: special nutritional planning [#permalink]

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25 Jul 2009, 13:10
sudeep wrote:
Why B is wrong?

I feel B is stronger than D.

honors students not changing their study habits(not grades) has nothing to do with the study on college students.
May be if it said the same about the 30 college students(with changed diet) instead of honors students, it could be right.
As it is B is out of scope and irrelevant.

are we in peace
Director
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Re: special nutritional planning [#permalink]

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25 Jul 2009, 13:42
1
What is OA and OE?
Also, please mention the source.

IMO:

Honor students are those who have high grades/achievement in the class.
What I Understand from B :

Honor students, who have altered their diets => (It means that they are among the college students on which the research has been done)

These Honor Students, who have altered their diets, didn't change their study habits and haven't scored better on average than other students, especially other honor students
The higher score of Honors students would had been the case if the research had been correct to say that the students who have altered their diet outperform others)
==> IMO it implies that study habits is important in improving the grade/performance as shown in the study of honor students and supports the research conclusion that nutritional diet doesn't affect the grades.

As said above, Comparison of two honor students is important here, for it implies that the nutritional effect doesn't work on honor students as they do not change their study habits.
This could be the reason for the other students too.

So, IMO, B is considering subset of students to prove that study is in fact accurate.
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Manager
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Re: special nutritional planning [#permalink]

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25 Jul 2009, 14:19
i get wat ur saying..thats very valid

only defense is ..i dont think you can assume that honors students is subset of college students..even if it were true.

OA is D.
Searched this question after getting it in the PR test I gave yesterday..felt it worth discussing.
I chose B there too :wink:

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: special nutritional planning   [#permalink] 25 Jul 2009, 14:19
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# A recent study of college students shows that, contrary to

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