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A recent study of college students shows that, contrary to

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A recent study of college students shows that, contrary to [#permalink] New post 15 May 2010, 00:39
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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.
[Reveal] Spoiler: OA
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Re: A recent study of college students shows that, contrary to [#permalink] New post 15 May 2010, 01:07
angel2009 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.>>> Out of scope

Honors students, after altering their diets, maintained that they did not change their study habits.>>> So, diets individually have not affected the performance >>> Also there is no information about the performance of honor students

Students who participated in various fitness regimens found that their grades improved appreciably after they altered their exercise habits.>>> diets individually have not affected the performance

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

All of the college students who volunteered for the study were either in their first or second year of college.>>> Out of scope
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Re: A recent study of college students shows that, contrary to [#permalink] New post 15 May 2010, 04:31
I've some thoughts in this.
Here the conclusion is Changing diet didn't improve performance.
Now if someone earlier studied 9 hour and after changing the diets studied 4 hours then his performance might not be improved and we can't conclude that diet change doesn't work.
Now even after maintaining same study habit etc if performance doesn't improve then we can confirm the conclusion.
I analyzed in this way and picked B.
Correct me if I'm wrong
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Re: A recent study of college students shows that, contrary to [#permalink] New post 15 May 2010, 04:47
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how about another reason - Some students were extremely poor in studies and received lower grades. But when they changed their diet, their grades impreoved.

Now, back to the question:
1. B4 the experiment, results were predicted.
2. After exp, it was shown that nutritional planning does not positively affect students’ grades.
3. Grades (30 std on nutri planning) ~= Grades (30 std not on nutri planning)

The main point here is b/w nutrixn planning and grades. So, choices dealing with this relationship will be of our concern. This is what stated in D.
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Re: A recent study of college students shows that, contrary to [#permalink] New post 15 May 2010, 04:51
Please see my comments below.

angel2009 wrote:
I've some thoughts in this.
Here the conclusion is Changing diet didn't improve performance.
Now if someone earlier studied 9 hour and after changing the diets studied 4 hours then his performance might not be improved and we can't conclude that diet change doesn't work. - What if they were doing some research and now after the diet planning, they were on documentation work. B clearly says no change in study habits.Now even after maintaining same study habit etc if performance doesn't improve then we can confirm the conclusion.
I analyzed in this way and picked B.
Correct me if I'm wrong

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Re: A recent study of college students shows that, contrary to [#permalink] New post 15 Jul 2010, 04:03
I am not sure if the wording of the question is appropriate. I chose D as well - but the other choices were mostly out of scope or irrelevant and only D seemed to have some connection with the stem. But the question is asking a choice that helps in determining its accuracy. Choice D only restates what's expected - but I would reckon that in order to verify accuracy - you need to find out some explanation about whether what's being stated is reasonable or not...D offers nothing extra apart from confirming what one would expect...i can't see how it verifies the accuracy...at best D is a strengthening choice.
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Re: A recent study of college students shows that, contrary to [#permalink] New post 15 Jul 2010, 05:13
D ...

Guess Someone tried to make a question similar to the question, where half the Rats are feeded some kinda food and some x chemical increases.

To evaluate : we need to make sure that all the rats had same amount of x chemical before the exp.

:idea: :o
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Re: A recent study of college students shows that, contrary to [#permalink] New post 17 Jul 2010, 03:47
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Re: A recent study of college students shows that, contrary to [#permalink] New post 17 Jul 2010, 10:09
D for me.

But the wording of the question was awkward and weird.
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Re: A recent study of college students shows that, contrary to [#permalink] New post 13 Jul 2014, 02:52
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Re: A recent study of college students shows that, contrary to [#permalink] New post 23 Jul 2015, 19:04
Hello from the GMAT Club VerbalBot!

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Re: A recent study of college students shows that, contrary to [#permalink] New post 23 Jul 2015, 20:09
angel2009 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?

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.


Hi
can any one please explain D ?
The argument says that diet had no impact on students' grades
where as answer says diet had dramatic impact of the students' grades.
What are we trying to evaluate here?
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A recent study of college students shows that, contrary to [#permalink] New post 23 Jul 2015, 21:59
anupamadw wrote:
angel2009 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?

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.


Hi
can any one please explain D ?
The argument says that diet had no impact on students' grades
where as answer says diet had dramatic impact of the students' grades.
What are we trying to evaluate here?



One would predict that a nutritional diet would benefit any student, but the study shows the exact opposite result. So, is that true of just college students? Or, would a reasonably predicted result not apply to other students as well?

Another way to look at it is that the study's conclusion is a generalization on all students. Introducing a different group of students will help to put some scope on the study, and thus evaluate its accuracy. Maybe students' grades won't noticeably improve if you're an "average" and generally good student (at least good enough to go to college), perhaps because they have already been on a good diet or other reasons like college lifestyle differences. So, would a balanced diet affect low grade students, or for that matter, Pre-12 grades, graduate, professional, technical, trade, associates, doctoral candidates, etc.?
A recent study of college students shows that, contrary to   [#permalink] 23 Jul 2015, 21:59
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