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A recent study of college students shows that, contrary to

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Re: CR: Nutrition Study [#permalink] New post 08 Aug 2012, 18:15
gixxer1000 wrote:
I get answer E.

Which of the following, if true, is most useful in determining the accuracy of the study described above?

We are only concerned about the accuracy of the study. The study looked at 60 students. If these 60 students were not a random group then the study would not be accurate. For example half the students could be seniors who tend to get steady grades because they have made it to their senior year and the other half could be freshmen whose grades are all over the place.

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

This is the only answer that adds to the validity of the study sample.

I agree. E is my answer as well.
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Re: A recent study of college students shows that, contrary to [#permalink] New post 05 Aug 2013, 10:02
Two things are relevant to measure the accuracy of the study. Whatever the accuracy might be doesn't matter.
1 Diet plan change.
2. Improvement/no improvement/downgrade(scores, performance)

D is the closest thing which talks about these two things.

D is the correct answer

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Re: CR: Nutrition Study [#permalink] New post 19 Aug 2013, 12:15
I agree with the explanation given for D. And why B is incorrect - Honors students, after altering their diets, maintained that they did not change their study habits - -- Study Habits does not guarantee improvement in the grades. May be taking nutritional diet improves the efficiency of student brain that helps him to get good grades with the same study habits.

Hope it helps.

Sunny


goalsnr wrote:
bhatiasanjay01 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?

i) Performance of business executives was shown to improve drastically after major alterations were made in their diets.
ii)Honors students, after altering their diets, maintained that they did not change their study habits.
iii)Students who participated in various fitness regimens found that their grades improved appreciably after they altered their exercise habits.
iv) High school students who previously had low grades found that after they altered their diets, their grades improved dramatically.
v) All of the college students who volunteered for the study were either in their first or second year of college.

I marked the answer at ii), because if no changes were made to the study habits then we can conclude that there was no effect of study habits on the study, hence effect of diet can be correctly determined (Whether it had some effect or not). But this answer is wrong :(. Can anybody explain the correct answer).


Conclusion: special nutritional planning does not positively affect students’ grades.
Evidence: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.

The evidence here is weak becuase it provides no details about the student's grade before and after the intake of special diet.Only D brings in information to say students with previously lower grades performed well after they started takin in special diet and refute the conclusion that special diet donot affect student's growth. This answer choice can used to measure the accuracy of this conclusion made in the argument.

D
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Re: A recent study of college students shows that, contrary to [#permalink] New post 19 Aug 2013, 22:12
bhatiasanjay01 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.

I marked the answer at ii), because if no changes were made to the study habits then we can conclude that there was no effect of study habits on the study, hence effect of diet can be correctly determined (Whether it had some effect or not). But this answer is wrong :(. Can anybody explain the correct answer).


I was torn between B and D on this one. I think both prove the accuracy of the test in their own way.

B seems like the better answer because the study resulted in no change after diet change. B claims that regardless of diet, study habits don't change. Thus, that's why the nutrition study is accurate, because people don't change their study habits due to diet so therefore, people who were given better meals did not perform better than those who did not.

D on the other hand seems to suggest the test is flawed. If the diet trick worked on younger kids, it should have worked on other people? Thus, the study's results must be inaccurate?

That's how I see those two answers. I ended up choosing B but that was wrong.
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Re: A recent study of college students shows that, contrary to [#permalink] New post 20 Aug 2013, 00:06
Hey animanga008, I hope I can help you clarify your doubt regrading this question.

This is the evaluate question. Solving this type of question can be challenging. However, we have the powerful technique called the variance test to determine the correct answer. So let's try the variance test on both answer (B) and (D).

(B) Honors students, after altering their diets, maintained that they did not change their study habits. Now apply the variance test. Honor students, after altering their diets, maintained that they did not change their study. Does this strengthen the argument that special nutritional planning does not positively affect students’ grades? We don't know because honor students are not the representatives of students as a whole. Let's negate the answer choice. Honor students, after altering their diets, maintained that they DID change their study. Does this weaken the argument? Again, we don't know for the same reason stated above. Thus, this answer choice is incorrect.


(D) High school students who previously had low grades found that after they altered their diets, their grades improved dramatically. If this is the case, this would weaken the argument by showing that special nutritional planning DOES positively affect students’ grades. If we negate the answer choice, high school students who previously had low grades found that after they altered their diets, their grades DID NOT improved dramatically. If this is the case, it would strengthen the argument by showing that special nutritional planning DOES NOT positively affect students’ grades. So, the variance test works for this answer choice and it is the correct answer.

I admit that this question is a bit weird; the question would be structured better if choice (D) states,"College students who previously had low grades found that after they altered their diets, their grades improved dramatically." Anyway, choice (D) is the best answer here because it covers more representative of students as a whole.
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Re: A recent study of college students shows that, contrary to [#permalink] New post 20 Aug 2013, 06:25
Option D is correct, since if the students who previously had poor grades improved their score after the planned nutritional diet, then the diet is supposed to have worked very much as the predicted result.
Re: A recent study of college students shows that, contrary to   [#permalink] 20 Aug 2013, 06:25
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