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A nutritionist studying the effects of massive doses of

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Re: CR-Gmatter wut???? [#permalink] New post 01 May 2010, 08:29
GMATBLACKBELT wrote:
A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.
Which of the following hypotheses is best supported by the evidence above?

A. The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.

B. Vitamin C is helpful in preventing disease.

C. Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.

D. Massive doses of vitamin C can help to prevent serious case of flu.

E. A balanced diet contains less than 250 mg of vitamin C



??????? I was going over questions I did in Gmatter last night.

I will go with "D".






Origanlly last night the answer was C, now today it says the answer is D???

What gives?

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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 13 Jun 2010, 07:48
must be true ques

The evidence presented in the argument is not complete ,so we cannot infer anything something that is definitely going to happen ,because ,in that case,author will give another evidence that disproves your answer to counter the solution, the answer has to be something that is probable
(D) says vitamin C can help ,it doesn’t say it will help to prevent => correct

if you choose answer (C) ,to counter you answer author canl provide further evidence something like

Doses of vitamin C that exceed the standard recommended daily allowance by 600 percent will not reduce the incidence of serious cases of flu by 25 percent.


correct me if my explanation is wrong :)
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Re: CR-Gmatter wut???? [#permalink] New post 18 Jul 2010, 08:35
D: Wonder if we have OA
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Re: CR-Gmatter wut???? [#permalink] New post 19 Jul 2010, 19:55
I think it is D.
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Re: CR-Gmatter wut???? [#permalink] New post 19 Jul 2010, 20:13
I went for D, but I was also tempted by C.

After read the entire thread, I agree that the main problem with D would be define "massive".

Rereading the question, I think I found the answer for this:

A nutritionist studying the effects of massive doses of vitamin C found that...

So, from nutritionist's point of view, I think we can consider 1,500mg a massive dosage. Hence answer D is correct.

What do you guys think?
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 08 Sep 2010, 18:33
if all the groups were having balanced diets + vitamin C tablets when why is it wrong to assume that the balanced diet < 250mg? I assume the #s reported are the tablets+food. I dont get why E is wrong. Is it because it is not a hypothesis?
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 14 Sep 2010, 05:32
i think D
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Re: CR-Gmatter wut???? [#permalink] New post 17 Sep 2010, 22:50
vbarrozo wrote:
I went for D, but I was also tempted by C.

After read the entire thread, I agree that the main problem with D would be define "massive".

Rereading the question, I think I found the answer for this:

A nutritionist studying the effects of massive doses of vitamin C found that...

So, from nutritionist's point of view, I think we can consider 1,500mg a massive dosage. Hence answer D is correct.

What do you guys think?


IMO D...
OA is also D. Mentioned at.... urch dot com / forums / gmat-critical-reasoning / 98722-nutritionist-studying-effects.html
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 09 Nov 2010, 04:45
What is OA?

I vote for E.
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 29 Nov 2010, 15:54
I don't get how D can be the oa.
Massive doses of vit c is based on the 1500 case - fewer than 9 pc- but the premise does not specify how many serious cases were accounted for by these 9 pc. The 250 case and the no vit c other than balanced diet case mention atleast x serious cases. So let's say if these 2 cases only accounted for one serious case per ill person and the 9 pc case each ill person reports 2 mn serious cases where they fall I'll repeatedly - then though the number of 9 pc is less - the number of serious cases can be more and it could be that vit c massive dose has no effect. How does d satisfy the "must be true" test?

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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 29 Nov 2010, 18:39
I'm also confused between C and D. Please help by providing and explaining the OA. Thanks
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 29 Nov 2010, 19:00
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automan wrote:
A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.

Which of the following hypotheses is best supported by the evidence above?

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.
(B) Vitamin C is helpful in preventing disease.
(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.
(D) Massive doses of vitamin C can help to prevent serious case of flu.
(E) A balanced diet contains less than 250 mg of vitamin C.


Quite a bit of confusion on this one... let's see if we can sort it out.

Read the question stem: Which of the following hypotheses is best supported by the evidence above?

The use of the word 'Hypotheses' signifies that what we are looking for is a proposition that is highly probable in the light of the data given in stimulus.
The stimulus provides evidence (premises) for one of the answer options. So that answer option must be a hypothesis that is supported by the stimulus.

Premises:
- massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu;
- of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu;
- of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.

Let's look at the options to see which one is supported by this data.

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.
Not supported by the study. We do not know how much vitamin C was taken by people who took a balanced diet only. Anyway, we cannot establish the direct proportion.

(B) Vitamin C is helpful in preventing disease.
Too generic. Talks of disease in general. Not supported by the study.

(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.
The popular but incorrect option. There is a difference between 'by 25%' and 'by 25 percent points'. If incidence of serious cases of flu was 34% and it reduces to 9%, that is a reduction of (34-9)/34 = 73.5% in the incidence. Or I can say that the incidence of serious flu has reduced by 25 percent points.
Similarly from 5%, if the growth rate goes up to 6%, that is an increase of 1/5 *100 = 20% (not 1%)
But I can say that the growth rate has increased by 1 percent point.

(D) Massive doses of vitamin C can help to prevent serious case of flu.
This is the hypothesis that is best supported by the study. Please note that it is not a 'must be true' statement. The author has already mentioned that these are hypotheses. We need to pick the one that is best supported by the stimulus. It is clear what massive doses are since the premise mentions "studying the effects of massive doses of vitamin C found that of a group...". The results of the study imply that massive doses of vitamin C can help prevent serious case of flu.

(E) A balanced diet contains less than 250 mg of vitamin C.
No information about this. If anything, in the group taking a balanced diet, the incidence of serious flu was slightly less than those taking 250 mg. So if we do want to infer something, we might be tempted to infer (wrongly, let me add) that a balanced diet has more than 250 mg of Vitamin C. We also don't know what kind of diet was taken by people taking 250 mg of Vitamin C.

Answer (D).
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 29 Nov 2010, 19:42
IMO D..

"...by 500 percent will reduce the incidence of serious..."

I rejected C because "will" made it too strong to be a hypothesis...
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 29 Nov 2010, 21:53
According to the websters dictionary "hypothesis" can mean one of 3 things. One of the listed meanings is: an assumption

When the GMAT uses the word "hypothesis" does it require the use of the "must be true" test associated with an assumption or even a conclusion or a simple can be true/likely standard used for strengthen/weaken questions?

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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 30 Nov 2010, 04:32
Expert's post
vaibhavtripathi wrote:
IMO D..

"...by 500 percent will reduce the incidence of serious..."

I rejected C because "will" made it too strong to be a hypothesis...


Though the choice of 'can' definitely makes more sense when putting forward a hypothesis, I still may not reject a choice solely on the basis of the use of 'will'. I can definitely formulate a conditional proposition such as:
If A happens, B will happen. - Here A is my hypothesis but the proposition is using 'will'.
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 30 Nov 2010, 04:44
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gmat1011 wrote:
According to the websters dictionary "hypothesis" can mean one of 3 things. One of the listed meanings is: an assumption

When the GMAT uses the word "hypothesis" does it require the use of the "must be true" test associated with an assumption or even a conclusion or a simple can be true/likely standard used for strengthen/weaken questions?

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Hypothesis means it is not an established fact. It is either used as 'working hypothesis' where it is a guess to guide further investigation or it is something highly probable in light of evidence provided. The second meaning is the way the word has been used here.

When the dictionary says that a hypothesis could be a mere assumption too, it means something that is not established to be true. Something that is just being assumed for some purpose. When we use 'assumption' in our CR questions as in 'which of the following is an assumption in the argument?', we mean that the argument was given by assuming something. [highlight]That assumption was taken to be true to arrive at the conclusion.[/highlight] That is why we check for 'must be true' with respect to the conclusion.

Conclusion is what you can infer without doubt. If the given premises are true, it must be true.
You can see a question that says "Which of the following can be concluded from the argument above?"
But you will not see "Which of the following hypothesis can be concluded from the argument above?" It will be "Which of the following hypothesis is [highlight]best supported[/highlight] by the argument above?"
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Re: nutritionist studying the effects of massive doses of vitami [#permalink] New post 30 Nov 2010, 07:01
great - thanks for clarifying that VeritasPrepKarishma!
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CR-Vitamin C And Flu [#permalink] New post 02 Sep 2011, 08:11
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A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.

Which of the following hypotheses is best supported by the evidence above?

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.
(B) Vitamin C is helpful in preventing disease.
(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.
(D) Massive doses of vitamin C can help to prevent serious case of flu.
(E) A balanced diet contains less than 250 mg of vitamin C.
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Re: GMAT_LSAT_CR [#permalink] New post 03 Sep 2011, 08:04
D?

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken. - Incorrect assumption
(B) Vitamin C is helpful in preventing disease. - Language too vague
(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent. - Language too specific :)
(D) Massive doses of vitamin C can help to prevent serious case of flu. - Correct
(E) A balanced diet contains less than 250 mg of vitamin C. - Irrelevant
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Re: CR-Vitamin C And Flu [#permalink] New post 04 Sep 2011, 15:23
bholakc wrote:
A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.

Which of the following hypotheses is best supported by the evidence above?

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.
(B) Vitamin C is helpful in preventing disease.
(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.
(D) Massive doses of vitamin C can help to prevent serious case of flu.
(E) A balanced diet contains less than 250 mg of vitamin C.
Re: CR-Vitamin C And Flu   [#permalink] 04 Sep 2011, 15:23
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