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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, 09:32
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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

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

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

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16 May 2009, 10:17
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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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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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17 May 2009, 01:32
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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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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17 May 2009, 02:10
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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In a certain wildlife park, park rangers are able to track [#permalink]

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13 Feb 2010, 10:48
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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 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 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
[Reveal] Spoiler:
OA = C
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Re: GMAT Prep 1: Rhinoceroses! [#permalink]

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18 Feb 2010, 17:33
carriedinterest wrote:
siddhartho wrote:
Is this really a 700 level Q? It was pretty easy than the others

I assumed that it was, as it came toward the end of GMAT Prep 1 (on which I finished with V 47).

Looking back at the question, I agree that it isn't very difficult. I guess my brain was tired after nearly 2.5 hours of GMAT!

I think you should change the tag and dumb it down to say a 500 level question. Awesome V score, by the way!
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Re: GMAT Prep 1: Rhinoceroses! [#permalink]

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04 Jul 2010, 10:51
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This is a relevant information question. The correct answer will be something where, if it goes one way it will strengthen the argument. If it goes the other way, it will weaken the argument. We can call this the "hybrid strengthen/weaken test".

The argument is: Because females who are frequently recollared have lower fertility rates than females who are not, there is a substance in the tranquilizer dart (the tranq. dart is used in the process of recollaring) that is (probably) causing the infertility.

Let's apply the test to choice C:

Quote:
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars

If they use the darts VERY frequently for a whole bunch of other reasons, then females who are recollared frequently may have, more or less, equal exposure to the dart relative to all the other rhinos. In that case, the connection between the dart and infertility is weakened--the argument is weakened.

Conversely, if they don't use the dart for any reason other than to recollar, then the link between the dart and infertility is strengthened--the argument is strengthened.

Let's briefly consider the other choices:

Choice A is irrelevant--we don't care about the numbers of collared versus uncollared females. The point is that of those collared infertility incidence is greater. This choice invites you to conflate numbers with percents.
Choice B--"other large mammals"--clearly outside the scope.
Choice E--this has nothing to do with the argument.
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Re: GMAT Prep 1: Rhinoceroses! [#permalink]

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14 Sep 2010, 09:53
Thanks for this question
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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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16 Jun 2011, 20:30
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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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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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24 Jun 2011, 08:05
C!
The rest of the choices are irrelevant.
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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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25 Jun 2011, 07:09
I thought A but seems like C is the correct answer.
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In a certain wildlife park, park rangers are able to track the movemen [#permalink]

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04 Apr 2012, 09:35
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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 significant lower fertility rate than uncollared females. Probably, therefore, some substances in the tranquilizer inhibit 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 trangquilizer dart to immobilize rhinoceroses for reasons other than attaching radio collars.
D. Whether male rhinoceroses in the wild park lose their collar any more often than the park's female rhinoceroses do
E. Whether radio collar is the only practical means that park rangers have for tracking the movements of rhinoceroses in the park.
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Re: In a certain wildlife park, park rangers are able to track the movemen [#permalink]

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19 Apr 2012, 00:39
C is the correct answer. Rest of the answers are actually irrelevant. Only C hits the target.
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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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24 Jul 2012, 01:38
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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.

Which of the following is an assumption on which the argument depends?

a) The dose of tranquilizer delivered by a tranquilizer dart is large enough to give the rangers putting collars on rhinoceroses a generous margin of safety.

b) The fertility rate of uncollared female rhinoceroses has been increasing in the past few decades.

c) Any stress that female rhinoceroses may suffer as a result of being immobilized and handled has little or no negative effect on their fertility.

d) the male rhinoceroses do not lose their collars as often as the female rhinoceroses do.

e) the tranquilizer used in immobilizing rhinoceroses is the same as used for other mammals.

Why is b wrong???
Can anyone explain....

In assumption question, the assumption should directly hit the conclusion , which states that the tranquilizers causes infertility.

We never know that if the un collared female rhinos are getting the tranquilizers injections or not(even for for other reasons).

So, (B) is incorrect choice.
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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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24 Jul 2012, 04:34
Hi,

To me, B is irrelevant. If the uncollared Rhinoceros fertility rate increases, decreases or stays stable, it's in no way a needed assumption to state that collared Rhino's fertility is decreasing because of the tranquilizer.

C on the other hand tells you that the author rules out the fact that collared Rhino's fertility didn't decrease because of the stress of getting collared. This is a needed assumption to the author's point.

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

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09 Jan 2013, 07:54
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.

Which of the following is an assumption on which the argument depends?

A. The dose of tranquilizer delivered by a tranquilizer dart is large enough to give the rangers putting collars on rhinoceroses a generous margin of safety.
B. The fertility rate of uncollared female rhinoceroses in the park has been increasing in the past few decades.
C. Any stress that female rhinoceroses may suffer as a result of being immobilized and handled has little or no negative effect on their fertility.
D. The male rhinoceroses in the wildlife park do net lose their collars as often as the park’s female rhinoceroses do.
E. The tranquilizer used in immobilizing rhinoceroses is the same as the tranquilizer used in working with other large mammals.
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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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09 Jan 2013, 09:02
C straight

The other options are out of scope. Easy one.

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

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09 Jan 2013, 09:45
Yes....indeed its C.
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Re: In a certain wildlife park, park rangers are able to track [#permalink]

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01 Jan 2014, 07:21
GOOD QUESTION!!!!! WE NEED TO FIND ASSUMPTION FIRST......
conclusion- some substance in the tranquilizer inhibits fertility.
premise[/color] - 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.

[color=#ed1c24]ASSUMPTION
- SINCE RECOLLARED FEMALE RHINOS HAVE SIGNIFICANTLY LOW INFERTILITY RATES WHILE OTHER FEMALES DON'T AND SOME SUBSTANCE IN THE TRANQUILIZER INHIBITS INFERTILITY..........THE BALANCE FEMALE RHINOS WERE NOT SUBJECT TO THIS TRANQUILIZER FOR OTHER REASONS AND HENCE THEY ARE FREE FROM ITS CHEMICALS WHICH EFFECT FERTILITY......AND HENCE some substance in the tranquilizer ONLY inhibits fertility
[/color]
WE THEREFORE NEED TO FIND IF THE BALANCE ALSO DUE TO OTHER REASONS WERE TRANQUILIZED........
CORRECT ANS " C"......
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars ------

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In a certain wildlife park [#permalink]

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20 Jan 2014, 01:40
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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 significant lower fetility rate than uncollared females. Probably, therefore, some subtances in the tranquilizer inhibit fertility.

Inevaluating 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 trangquilizer dart to immobilize rhinoceroses for reasons other than attaching radio collars.
d. Whether male rhinoceroses in the wild park lose their collar any more often than the park's female rhinoceroses do
e. Whether radio collar is the only pratical means that park rangers have for tracking the movements of rhinoceroses in the park.

Hello.

I have no doubt about the correct choice because it exploits the flaw in the argument.
But I still have a doubt about choice A.
The author makes a comparison between the fertility rates between 2 groups to support his conclusion. If there are 1000 recollared rhinos and 10 uncollared rhinos, and the fertility rates are 50% and 80% respectively, so we have 500 fertile recollared rhinos and 8 fertile uncollared rhinos.

if the difference between numbers of the two groups are too large-- i.e. 1000 and 10 -- and if we accept the author's assumption that the only purpose to shoot rhinos with T darts is to put collar, does the comparison between the fertile rates support the conclusion?

I must ask the question because before I see the correct answer I did not know the flaw of the argument, and the choice A seems good to me. So, if I know the answer for the question, I can eliminate choice A.

Thank you.
In a certain wildlife park   [#permalink] 20 Jan 2014, 01:40

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