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# The number of North American children who are obese that is,

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The number of North American children who are obese that is, [#permalink]  22 Feb 2010, 09:57
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Difficulty:

5% (low)

Question Stats:

33% (02:28) correct 66% (01:41) wrong based on 42 sessions
The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing, according to four major studies conducted over the past 15 years.
If the finding reported above is correct, it can be properly concluded that
(A) when four major studies all produce similar results, those studies must be accurate
(B) North American children have been progressively less physically active over the past 15 years
(C) the number of North American children who are not obese increased over the past 15 years
(D) over the past 15 years, the number of North American children who are underweight has declined
(E) the incidence of obesity in North American children tends to increase as the children grow older

OA is
[Reveal] Spoiler:
c
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Re: pl help [#permalink]  22 Feb 2010, 10:19
(A) when four major studies all produce similar results, those studies must be accurate.
>> This does not seem to be a proper conclusion.
(B) North American children have been progressively less physically active over the past 15 years.
>> I think this is the answer. But here I am assuming increase in the body fat reduces physical action.
(C) the number of North American children who are not obese increased over the past 15 years
>> This would be a contradiction.
(D) over the past 15 years, the number of North American children who are underweight has declined
>> We have no clue here.
(E) the incidence of obesity in North American children tends to increase as the children grow older
>> The paragraph does not talk about the children age. But I am a little bit confused with this statement.

My final answer would be B.
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Re: pl help [#permalink]  22 Feb 2010, 10:44
I was debating between A & B, and then I saw the OA is C.

Is the OA incorrect or am I missing something?
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Re: pl help [#permalink]  22 Feb 2010, 12:13
vaivish1723 wrote:
The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing, according to four major studies conducted over the past 15 years.
If the finding reported above is correct, it can be properly concluded that
(A) when four major studies all produce similar results, those studies must be accurate
(B) North American children have been progressively less physically active over the past 15 years
(C) the number of North American children who are not obese increased over the past 15 years
(D) over the past 15 years, the number of North American children who are underweight has declined
(E) the incidence of obesity in North American children tends to increase as the children grow older

OA is
[Reveal] Spoiler:
c

Lets say 15 yrs back we had 100 kids and 15 kids were obese. Also it means that 15% were obese.
At this point of time "The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing"...it means that number of kids in 15% category is increasing. When it can happen...

if i want to increase the no. of kids in 15% category, i have to also increase kids in 85% category.

Example we have 200 kids now. so 15% is 30 kids. So the number of obese kids has increased but also no.of non-obese kids 85%(170) increased. Hence C.
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Re: pl help [#permalink]  22 Feb 2010, 13:04
nverma, thanks for the explanation but I am still not convinced...

The number of North American children who are obese is steadily increasing. The question does not talk about specific % or say that the ratio between obese and non-obese children is fixed which is the basis of your explanation...

If the % or ratio stays constant, then C is the answer...but I don't see that in the question...
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Re: pl help [#permalink]  23 Feb 2010, 03:03
yogesh27 wrote:
nverma, thanks for the explanation but I am still not convinced...

The number of North American children who are obese is steadily increasing. The question does not talk about specific % or say that the ratio between obese and non-obese children is fixed which is the basis of your explanation...

If the % or ratio stays constant, then C is the answer...but I don't see that in the question...

In fact, stimulus does say that the ratio between obese and non-obese children is constant. It's because of the way "obese" has been defined:

The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing ...

This definition implies that obese children will always be top 15-percentile by body fat
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Re: pl help [#permalink]  23 Feb 2010, 16:11
nverma wrote:
vaivish1723 wrote:
The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing, according to four major studies conducted over the past 15 years.
If the finding reported above is correct, it can be properly concluded that
(A) when four major studies all produce similar results, those studies must be accurate
(B) North American children have been progressively less physically active over the past 15 years
(C) the number of North American children who are not obese increased over the past 15 years
(D) over the past 15 years, the number of North American children who are underweight has declined
(E) the incidence of obesity in North American children tends to increase as the children grow older

OA is
[Reveal] Spoiler:
c

Lets say 15 yrs back we had 100 kids and 15 kids were obese. Also it means that 15% were obese.
At this point of time "The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing"...it means that number of kids in 15% category is increasing. When it can happen...

if i want to increase the no. of kids in 15% category, i have to also increase kids in 85% category.

Example we have 200 kids now. so 15% is 30 kids. So the number of obese kids has increased but also no.of non-obese kids 85%(170) increased. Hence C.

Good explanation. I chose C for the same reasoning.
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Re: pl help [#permalink]  09 Feb 2011, 22:53
nverma wrote:
vaivish1723 wrote:
The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing, according to four major studies conducted over the past 15 years.
If the finding reported above is correct, it can be properly concluded that
(A) when four major studies all produce similar results, those studies must be accurate
(B) North American children have been progressively less physically active over the past 15 years
(C) the number of North American children who are not obese increased over the past 15 years
(D) over the past 15 years, the number of North American children who are underweight has declined
(E) the incidence of obesity in North American children tends to increase as the children grow older

OA is
[Reveal] Spoiler:
c

Lets say 15 yrs back we had 100 kids and 15 kids were obese. Also it means that 15% were obese.
At this point of time "The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing"...it means that number of kids in 15% category is increasing. When it can happen...

if i want to increase the no. of kids in 15% category, i have to also increase kids in 85% category.

Example we have 200 kids now. so 15% is 30 kids. So the number of obese kids has increased but also no.of non-obese kids 85%(170) increased. Hence C.

I agree with nverma only if this was an inference question. In order C to be a correct answer the words "it can be properly concluded" ought to be replaced with the words " it can be properly inferred" because the stmt in C is actually an inference with regard to the overall content of the main text. But in order it to be a conclusion the right answer has to encompass the maint point of the stem which is about the proportion of obese children to other children.
Other options are also not strong contenders. For explanation one can look through explanations of others above.
Hence, the OA is contestable.
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Re: pl help [#permalink]  09 Feb 2011, 23:09
yogesh27 wrote:
nverma, thanks for the explanation but I am still not convinced...

The number of North American children who are obese is steadily increasing. The question does not talk about specific % or say that the ratio between obese and non-obese children is fixed which is the basis of your explanation...

If the % or ratio stays constant, then C is the answer...but I don't see that in the question...

You are thinking in a right direction that C is obviuosly contestable.
But I think E could be a right answer if in its stmt there were given an information about proportion between obese and other children for the 15 year period.
Otherwise, C can be a right answer only if the qeustion was the inference question.
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Re: pl help [#permalink]  11 Feb 2011, 11:18
This question is from the Master the LSAT ebook .Ron (MGMAT) has advised a few refrains when working thru this book on BTG.I advise you google search on BTG and read.
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Re: pl help [#permalink]  11 Feb 2011, 12:39
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+1 C

If the number of obese children is increasing, but its percentage of participation still being 15%, then the number of "thin" children has to increase in order to remain in 85%.
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Re: pl help [#permalink]  11 Feb 2011, 13:00
metallicafan wrote:
+1 C

If the number of obese children is increasing, but its percentage of participation still being 15%, then the number of "thin" children has to increase in order to remain in 85%.

+1 Kudos to metallicafan for encouraging me to look thru a quantitative perspective
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Re: pl help [#permalink]  14 Feb 2011, 23:52
Cool question!
Actually, C seems to be a bit strange and contradictionary, but when we evaluate the proportion - this variant is more relevant than D.
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Re: pl help [#permalink]  07 Mar 2011, 09:54
nverma wrote:
vaivish1723 wrote:
The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing, according to four major studies conducted over the past 15 years.
If the finding reported above is correct, it can be properly concluded that
(A) when four major studies all produce similar results, those studies must be accurate
(B) North American children have been progressively less physically active over the past 15 years
(C) the number of North American children who are not obese increased over the past 15 years
(D) over the past 15 years, the number of North American children who are underweight has declined
(E) the incidence of obesity in North American children tends to increase as the children grow older

OA is
[Reveal] Spoiler:
c

Lets say 15 yrs back we had 100 kids and 15 kids were obese. Also it means that 15% were obese.
At this point of time "The number of North American children who are obese—that is, who have more body fat than do 85 percent of North American children their age—is steadily increasing"...it means that number of kids in 15% category is increasing. When it can happen...

if i want to increase the no. of kids in 15% category, i have to also increase kids in 85% category.

Example we have 200 kids now. so 15% is 30 kids. So the number of obese kids has increased but also no.of non-obese kids 85%(170) increased. Hence C.

*******

disagree, your conclusion could be properly reached based on the argument since the argument did not say the sample size changed. what about still 100 kids, if the number of obese kids increased, then the non-obese decreased.
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Re: pl help [#permalink]  08 Mar 2011, 15:08
they changed the definition of obesity here..
probably thats what confused us
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Re: pl help [#permalink]  03 May 2011, 10:10
yes simple question with a simple explanation. nailed it in 1:07 min . i think the stimulus is very straight forward, if you have more body fat than than 85 % children you are obese. if you have less or equal body fat than 85 % children you are not obese. there is a distinct boundary ,
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Re: pl help [#permalink]  03 May 2011, 10:21
The only answer that is workable seems to be C. The very idea of childhood obesity is set up as a proportional one (ie, if over 85% of average childhood body fat), so the overall number of children *had* to have increased if the *number* of obese children increasing is the issue.

A - Question stem doesn't prove this answer. (A correlation analysis would.)
B - Question stem does not go beyond the simple increase in obesity
D - Not a zero sum game -- has nothing to do with question stem
E - Not the topic -- age range presumably held constant to define "children"

If there's any hole in my reasoning, I welcome comments. As I can benefit from it too.
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Re: pl help [#permalink]  16 May 2011, 23:38
Thus, numbers of non overweight children are also increasing.
C
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Re: pl help [#permalink]  17 May 2011, 18:44
C
Re: pl help   [#permalink] 17 May 2011, 18:44
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