In a certain wildlife park, park rangers are able to track : GMAT Critical Reasoning (CR)
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# In a certain wildlife park, park rangers are able to track

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In a certain wildlife park, park rangers are able to track [#permalink]

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16 May 2009, 08:32
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In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars. When, as often happens, a collar slips off, it is put back on. Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart. Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. Probably, therefore, some substance in the tranquilizer inhibits fertility.
In evaluating the argument, it would be most useful to determine which of the following?

A. Whether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park.
B. How the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
D. Whether male rhinoceroses in the wildlife park lose their collars any more often than the park’s female rhinoceroses do
E. Whether radio collars are the only practical means that park rangers have for tracking the movements of rhinoceroses in the park

Kindly provide your explanation. I do not agree with OA.
[Reveal] Spoiler: OA

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16 May 2009, 09:17
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This is C. Use yes-no question technique

In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars. When, as often happens, a collar slips off, it is put back on. Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart. Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. Probably, therefore, some substance in the tranquilizer inhibits fertility.
In evaluating the argument, it would be most useful to determine which of the following?

A. Whether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park -->If yes, no influence. If no, no influence
B. How the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals -->If yes, no influence. If no, no influence
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars -->the best. If yes, it weakens that why only recently collared rhinos have lower fertility rates, because recently uncollared rhinos can still be injected tranquillizer for other reasons, so they can be equally affected as are collared rhinos. If no, it does strengthen the argument
D. Whether male rhinoceroses in the wildlife park lose their collars any more often than the park’s female rhinoceroses do -->If yes, no influence. If no, no influence
E. Whether radio collars are the only practical means that park rangers have for tracking the movements of rhinoceroses in the park -->If yes, strengthen ? If no, it does have a reason to weaken. However, it's not so strong as C, because it doesn't mean park rangers will inject something to rhino's body. They can use an outside-the body effect to track the rhino's movement so that rhinos's fertility is not affected
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16 May 2009, 13:48
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17 May 2009, 00:32
priyankur_saha@ml.com wrote:
In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars. When, as often happens, a collar slips off, it is put back on. Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart. Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. Probably, therefore, some substance in the tranquilizer inhibits fertility.
In evaluating the argument, it would be most useful to determine which of the following?

A. Whether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park.
B. How the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
D. Whether male rhinoceroses in the wildlife park lose their collars any more often than the park’s female rhinoceroses do
E. Whether radio collars are the only practical means that park rangers have for tracking the movements of rhinoceroses in the park

Kindly provide your explanation. I do not agree with OA.

Male rhinoceroses are also responsiblr for the fertility. If male rhinoceroses did not loose their collars any more often than the female, the immobilization cannot make the fertility lower. Right?

D should be the best
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17 May 2009, 01:10
gmatee wrote:
Quote:
Male rhinoceroses are also responsiblr for the fertility. If male rhinoceroses did not loose their collars any more often than the female, the immobilization cannot make the fertility lower. Right?

Sondenso, your point is very interesting too, but i think this argument no longer mentions any evidence of the male' fertility. The only evidence we have here is the female's fertility: Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. So we cannot assume that the fertility of male rhinoceroses is affected by tranquilizer dart. Maybe it makes male rhinos more active in fertility or maybe not

Guy, I do not say the fertility of the male rhinoceroses, your understanding of my wordings makes fun
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17 May 2009, 02:57
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gmatee wrote:
Quote:
Male rhinoceroses are also responsiblr for the fertility. If male rhinoceroses did not loose their collars any more often than the female, the immobilization cannot make the fertility lower. Right?

Sondenso, your point is very interesting too, but i think this argument no longer mentions any evidence of the male' fertility. The only evidence we have here is the female's fertility: Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. So we cannot assume that the fertility of male rhinoceroses is affected by tranquilizer dart. Maybe it makes male rhinos more active in fertility or maybe not

Guy, I do not say the fertility of the male rhinoceroses, your understanding of my wordings makes fun

Very funny, male rhino has fertility, so I will bear a baby in near future, lol

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17 May 2009, 12:30

I was expecting to see something related to chemical composition of tranquilizer in answer choices.

So three items -- recollar, tranquilizer and fertility--are here. If recollar is not the culprit, tranquilizer will be main cause that inhibits fertility. Is it the correct reasoning?
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17 May 2009, 22:26
gmatee wrote:
Quote:
Very funny, male rhino has fertility, so I will bear a baby in near future, lol

Both men and women have fertility capacity. For men,they can produce sperm. For women, they can produce ovum and give birth.

In my dictionary book, fertility means the capability of giving birth, not the capability of producing sperm.

Btw, this is not what I want to argue, OA please ?
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18 May 2009, 07:09
What's the OA?

Why is B wrong?
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18 May 2009, 09:18
whats the OA?
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19 May 2009, 02:59
I feel the B is the right answer..
No other answer choices will give options which will determine the composition of the tranquilizer..

by using the variance test..

If it differs a lot from the tranquilizers for other mammals, then it strengthens the argument.
If it doesn't differ a lot for other mammals, then it weakens the argument. It suggests that there is something wrong
with the Rhino's body itself...and not the tranquilizer...

Anyways.. whats the OA ?
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19 May 2009, 07:06
OA is C.
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19 May 2009, 09:04
priyankur_saha@ml.com wrote:
OA is C.

Is there an OE? cant make sense out of C
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19 May 2009, 22:20
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True..

i got the point now.. C should the answer which is more relevant..

I was missing the point that comparison is being made between collared and uncollared females..

Good learning point..have to read the argument closely..
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08 Jun 2009, 04:45
I'd go with C as well.
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16 Jun 2011, 19:30
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@Onell: Here goes...

'Useful to evaluate' questions are generally hard. You focus on the conclusion and ask yourself, "What is the gap in the logic? What more do I need to figure whether the conclusion is valid?"

Here is the argument:
Often, collars slip.
When a collar slips, the animal is shot with a tranquilizer to re-collar.
Fertility of frequently recollared females <<< fertility of uncollared females. (Mind you, it doesn't compare collared females with uncollared)

Conclusion: tranquilizer inhibits fertility

The assumption here is that only frequently re-collared females get tranquilizer shots. Hence, only their fertility is low. Therefore, tranquilizer is the culprit.

I would like to know the following: Do uncollared females also get many tranquilizer shots? If yes, then the tranquilizer does not explain the low fertility. If they do not get many tranquilizer shots, then the tranquilizer could explain the low fertility.

Option C asks this question: How many times are tranquilizers used for other reasons? Those reasons would be common to collared and uncollared females. If, for other reasons, the tranquilizers are used very often, the effect on only the frequently collared females can not be explained by tranquilizers.
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24 Jun 2011, 07:05
C!
The rest of the choices are irrelevant.
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25 Jun 2011, 06:09
I thought A but seems like C is the correct answer.
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25 Jun 2011, 06:55
I understand why the answer is C, but I feel the question is somewhat misleading. The vignette does not introduce that uncollared rhinos are given tranquilizer shots for "other reasons" -- and one has to surmise that from answer C.

Now, in an evaluate-the-argument type of question, aren't we supposed to only rely on the vignette to evaluate the argument? If that is so, all we can do is compare percentages of female collared and uncollared rhinos to their respective fertility rates. And therefore answer A sounds appropriate. However, if these type of questions allow the options to introduce a further premise into the vignette, then I guess I stand correct in my argument!
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11 Aug 2011, 04:14
Anyway, I support E.Because if the answer is NO, the conclusion is weakened.;if the answer is YES,of course the conclusion is supported.No other option leads to the low fertility.
Re: In a certain wildlife park, park rangers are able to track   [#permalink] 11 Aug 2011, 04:14

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