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# A nutritionist studying the effects of massive doses of

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A nutritionist studying the effects of massive doses of [#permalink]

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10 Sep 2005, 05:41
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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.
[Reveal] Spoiler: OA

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Re: nutritionist studying the effects of massive doses of vitami [#permalink]

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29 Nov 2010, 20:00
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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.

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11 Sep 2005, 02:15
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That is truly a tough question.
I would go for E.

Reasons:

A : The third fact that only 32% of the ppl suffered chances even though they did not consume any additional C vitamin disporves this theory

B : Too general a statement

C n D : Only a part of the para supports this hypothesis.

E : again, seems a bit too general. But, I would like to stick to this.

OA/OE Plz.
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02 Sep 2011, 09:11
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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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10 Sep 2005, 13:28
My pick is D.
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hey ya......

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10 Sep 2005, 14:10
D is good

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10 Sep 2005, 15:00
(D)

(C) is wrong because it enforces that flu were due to deficiency of flu.

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10 Sep 2005, 19:39
D, though not very sure about it. E may also be considered, I guess.

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11 Sep 2005, 02:10
"D" should be right.

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15 Sep 2005, 19:04
I wud pick D. The para starts with "A nutritionist studying the effects of massive doses of vitamin C .."

GA

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15 Sep 2005, 19:10
gandy_achar wrote:
I wud pick D. The para starts with "A nutritionist studying the effects of massive doses of vitamin C .."

GA

Good reasoning achar! I was mulling over B, which is indeed too general a statment.

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16 Sep 2005, 03:21
ywilfred 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 will go with "B".

Please do POST OA of this question...

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16 Sep 2005, 10:08
(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 argument. A higher percentage of people who took more than 250mg got a serious case than those who took no vitamin C.

(B) Vitamin C is helpful in preventing disease.
-We're talking about the flu, not all 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.
-Not supported.

(D) Massive doses of vitamin C can help to prevent serious case of flu.
-Supported by the argument. Massive doses CAN help but don't guarantee prevention.

(E) A balanced diet contains less than 250 mg of vitamin C.
-The argument is about vitamin C and flu. Not about a balanced diet.

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30 Sep 2005, 11:58
Why is C wrong??

This is supported by the argument => 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

daily allowance is 250mg. So if this amount is increased by 500 percent, it will be 1500mg. The incidence will be reduced from 34% to 9%.

=> That is correct? Why is not supported?

Thanks.

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30 Sep 2005, 12:17
gmat2006 wrote:
Why is C wrong??

This is supported by the argument => 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

daily allowance is 250mg. So if this amount is increased by 500 percent, it will be 1500mg. The incidence will be reduced from 34% to 9%.

=> That is correct? Why is not supported?

Thanks.

My best guess why C is wrong is, you cannot subtract 34 and 9% because the 9% is for serious cases of flu and 34% is for alteast one serious case of flu
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01 Oct 2005, 06:09
I would choose D.

I think C is wrong because it says "will reduce the incidence of serious cases of flu by 25 percent", meaning that if we have a total population of x individuals, with the standard recommended daily allowance we have 0.34*x cases of flu. If we reduce this by 25% we have 0.75*0.34*x=22.5% that is a lot more than the 9% in the argument

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01 Oct 2005, 08:04
crisnas wrote:
That is truly a tough question.
I would go for E.

Reasons:

A : The third fact that only 32% of the ppl suffered chances even though they did not consume any additional C vitamin disporves this theory

B : Too general a statement

C n D : Only a part of the para supports this hypothesis.

E : again, seems a bit too general. But, I would like to stick to this.

OA/OE Plz.
Krishna

I agree with Krishna, (E).

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01 Oct 2005, 09:10
Well my choice is E. Here goes my reasoning.

Choice D is strong statement to choose. It indicates that Massive doses of vitamin C can help to prevent serious case of flu. Furthermore in the argument it is mentioned that when a group takes 1500 mg of vitamin C, fewer than 9 percent suffered.

Choice B same reasoning too strong statement. Vitamin C is helpful in preventing disease.

Choice A is wrong as in the passage when the people start taking 250 gm of vitamin C, 34 percent suffered at least one serious case of flu.

Choice C is wrong and well explained by ranga.

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01 Oct 2005, 09:34
Well after giving a careful thought i came to another conclusion which is different from my last post.

In case if we think that balanced diet contains more than 250 mg of vitamin C and we can do so because it is nowhere mentioned in the paragraph that it is less than 250 mg.

In that case choice E is wrong.
Choice D is wrong as last group who takes balanced diet (more than 250mg of vitamin C) also have less number of serious cases.

Choice C is wrong, see ranga post.

Choice B is strong statement as it is not fully able to eradicate the disease.

Choice A is correct in that case.

What is OA? I doubt whether this question is of ETS Quality?

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01 Oct 2005, 13:08
A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.

IF more Vitamin C is needed to reduce FLY, than the argument is weakened.

(B) Vitamin C is helpful in preventing disease.

Who cares what do vitamin C do in general ? OUT

(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.

and? If they reduce by 25%, 30% or 50%, Who cares?

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

IF more vitamin C is needed to prevent serious case of Flu, than it is totaly true, than those who took 1500mg suffered less FLu than the others.

(E) A balanced diet contains less than 250 mg of vitamin C.
and? who cares how much Vitamin C contains a balanced diet ?

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01 Oct 2005, 13:08

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