Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 17 Jul 2019, 01:54

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

In a certain wildlife park, park rangers are able to track the movemen

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Director
Director
User avatar
Joined: 25 Oct 2006
Posts: 505
In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post Updated on: 03 Oct 2018, 07:09
12
67
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

60% (01:53) correct 40% (02:12) wrong based on 2248 sessions

HideShow timer Statistics


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

U.S. News & World Report - Volume 127, Issues 17-25 - Page 196

https://books.google.com.my/books?id=o4nuAAAAMAAJ
1999 - ‎Snippet view - ‎More editions
As Cole watched, the prostrate rhino was injected with an antidote to the immobilization dart that she had shot. In less than a ... Across the globe, thousands of wild animals are darted each year by scientists to be moved, studied, or fitted with radio tracking collars. But the ... Below, loading the tranquilizer dart. dart safaris.

_________________
If You're Not Living On The Edge, You're Taking Up Too Much Space

Originally posted by priyankur_saha@ml.com on 16 May 2009, 09:32.
Last edited by hazelnut on 03 Oct 2018, 07:09, edited 2 times in total.
Edited the question.
Most Helpful Expert Reply
Veritas Prep GMAT Instructor
User avatar
D
Joined: 16 Oct 2010
Posts: 9437
Location: Pune, India
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 16 Jun 2011, 20:30
36
10
@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:
Many rhinoceroses wear radio collars.
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.
_________________
Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >
Most Helpful Community Reply
Manager
Manager
avatar
Joined: 30 Mar 2009
Posts: 199
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 16 May 2009, 10:17
13
7
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
General Discussion
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1563
Schools: CBS, Kellogg
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 17 May 2009, 01:32
1
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
_________________
Kaplan GMAT Instructor
User avatar
Joined: 21 Jun 2010
Posts: 69
Location: Toronto
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 04 Jul 2010, 10:51
5
4
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 D--irrelevant--nothing about the dart.
Choice E--this has nothing to do with the argument.
Senior Manager
Senior Manager
User avatar
B
Status: Final Countdown
Joined: 17 Mar 2010
Posts: 424
Location: United States (NY)
GPA: 3.82
WE: Account Management (Retail Banking)
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 24 Jul 2012, 01:38
1
rahulsukhija 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.

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.
_________________
" Make more efforts "
Press Kudos if you liked my post
Intern
Intern
avatar
Joined: 06 May 2013
Posts: 11
Location: United States
GMAT 1: 700 Q49 V36
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 20 Jan 2014, 01:40
2
2
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.
Manhattan Prep Instructor
User avatar
Joined: 30 Apr 2012
Posts: 792
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 21 Jan 2014, 12:45
2
2
This is a nice question with a good degree of difficulty. The key to these questions (evaluating the argument) is to understand assumptions, which are unstated elements that bridge the gap between premises and conclusions. On this question type, your answer will essentially be a question that asks for clarification about a key assumption. As you mentioned, C does provide a question focused on a key assumption (tranquilizers are only used for recollaring).

Now to your question regarding answer choice A. The reason why A would not be our answer is because the premise of the argument deals with fertility RATES not fertility numbers. The GMAT will often shift between figures and rates in the argument/answer choices to throw you off. The use of rates takes the actual numbers out of the equation (essentially normalizing/standardizing the data). Any answer choices that shift from rates to absolute numbers (or vice versa) will not be correct.

KW
_________________
Manhattan Prep Instructor
User avatar
Joined: 30 Apr 2012
Posts: 792
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 18 Apr 2014, 13:18
2
TooLong150 wrote:
I know that this is a Causation Question, but I don't know how any of the answers address the Causation assumptions that tranquilizers cause lower fertility rates.


Well, only one of them will address the assumption. :)

The conclusion states that the tranquilizer inhibits fertility. This conclusion is based on the information that recollared rhinos have to be tranquilized in the process and recollared rhinos have lower fertility rates.

The question wants to you evaluate the argument - or in other words to determine what information you would like to have to assess the validity of the argument. To best evaluate the argument, you want some of the "missing" data related to tranquilizer use, recollaring and fertility. Answer choice C gets at that "missing" data by suggesting that there might be other uses for tranquilizers. If there are other uses, we lose our tight connection between recollaring, tranquilizers and fertility and, as a result, we have less confidence in the conclusion. If there are no other uses, that tight connection remains and our confidence in the conclusion increases.

To use your Causation language, the argument notices correlation between recollaring and fertility and asserts that tranquilizers are the cause of the correlation. Answer choice C suggests that we need to know if there are other uses for tranquilizers before we feel comfortable that they are causing the fertility problems.

KW
_________________
Retired Moderator
User avatar
B
Status: Getting strong now, I'm so strong now!!!
Affiliations: National Institute of Technology, Durgapur
Joined: 04 Jun 2013
Posts: 435
Location: United States (DE)
GPA: 3.32
WE: Information Technology (Health Care)
GMAT ToolKit User Reviews Badge
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 09 Jan 2015, 01:08
I will try to put this in simpler terms:
Conclusion : Tranquilizer --> Inhibits infertility
Premise : 2categories of rhinos (collared and uncollared).
We will use the variance test to anayse
options:
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
strengthen: Very often tranquilizers are used other than collaring--> uncollared sets of rhinos could also be tranquilized under this condition. So if tranqs were to inhibit fertility then this group of uncollared rhinos should become infertile as well
Weaken: Not as much ---> then the conclusion is not that much affected
Hence C
Intern
Intern
avatar
Joined: 06 Jun 2014
Posts: 45
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 25 May 2015, 17:59
2
I think the key to solve this problem successfully is to realize that there are 2 groups of rhinos, one with radio tag and other w/o the tag. If you assume that all rhinos are actually being tagged than you wont get to the correct solution. What I want to say is that once a tag fall off than the same rhino is tranquilized again and again and again... and you will say with certainty that the tranq is the culprit for the fertility only if compared with other rhinos w/o a tagg and never been tranqed and their fertility rate.
I admit I would not had that in mind on test day. I assumed that all rhinos in the park were tranqulized in order to get the tag, the difference is that I made a group one more frequently transited and the other group let say only once, and I was looking for answer in these lines and it took me nowere :( All answers were irelevant , my best bet was on D even though I knew males are not in the argument. If there was expeclitly stated that tehre are rhinos that dont have tagges at all than I would go for C, but I didnt assume that and got it wrong.
Hope my reasoning helps
Current Student
User avatar
Joined: 28 Sep 2013
Posts: 66
Location: United States (NC)
Concentration: Operations, Technology
WE: Information Technology (Consulting)
Reviews Badge
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 25 Jun 2015, 01:44
WaterFlowsUp wrote:
I will try to put this in simpler terms:
Conclusion : Tranquilizer --> Inhibits infertility
Premise : 2categories of rhinos (collared and uncollared).
We will use the variance test to anayse
options:
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
strengthen: Very often tranquilizers are used other than collaring--> uncollared sets of rhinos could also be tranquilized under this condition. So if tranqs were to inhibit fertility then this group of uncollared rhinos should become infertile as well
Weaken: Not as much ---> then the conclusion is not that much affected
Hence C


hi,

the whole logic of this argument depends on the assumption that tranquilizer darts are also used for reasons other than attaching radio collars.
we need to assume this w/o which choice C fails. But, how should we know that we need to consider this assumption while answering?
_________________
_________________________________
Consider Kudos if helpful
Veritas Prep GMAT Instructor
User avatar
D
Joined: 16 Oct 2010
Posts: 9437
Location: Pune, India
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 25 Jun 2015, 21:27
thoufique wrote:
WaterFlowsUp wrote:
I will try to put this in simpler terms:
Conclusion : Tranquilizer --> Inhibits infertility
Premise : 2categories of rhinos (collared and uncollared).
We will use the variance test to anayse
options:
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
strengthen: Very often tranquilizers are used other than collaring--> uncollared sets of rhinos could also be tranquilized under this condition. So if tranqs were to inhibit fertility then this group of uncollared rhinos should become infertile as well
Weaken: Not as much ---> then the conclusion is not that much affected
Hence C


hi,

the whole logic of this argument depends on the assumption that tranquilizer darts are also used for reasons other than attaching radio collars.
we need to assume this w/o which choice C fails. But, how should we know that we need to consider this assumption while answering?


No, you don't have to assume that darts are used for other purposes. Option (C) tells you that you have to find out whether they are used for other reasons and if yes, then how often are they used. The answer to question in (C) could be 'Never' or it could be 'every week'. This would tell you whether the data you collected about collared rhinos and uncoloured rhinos is reliable.
_________________
Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >
Manager
Manager
User avatar
Joined: 02 Nov 2014
Posts: 185
GMAT Date: 08-04-2015
GMAT ToolKit User Reviews Badge
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 30 Sep 2015, 07:51
1
My take:
In order to evaluate this argument, it would be useful to pre-think the assumptions.
C: some substances in the tranquilizer inhibit fertility in recollared female rhinoceroses.
One assumption could be: Other (uncollared) female rhinos do not have to face the tranquilizer as often as the collared one. Otherwise, how could we say that tranquilizer is the culprit?
Now we can formulate our evaluate Qn around this assumption: How often other (uncollared) female rhinos are tranquilized?
Note: choice C is just a reword of the Q that we just derived.

POE can also be used but chances of mistake increases a bit.

Binit.
GMAT Club Verbal Expert
User avatar
D
Status: GMAT and GRE tutor
Joined: 13 Aug 2009
Posts: 2666
Location: United States
GMAT 1: 780 Q51 V46
GMAT 2: 800 Q51 V51
GRE 1: Q170 V170
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 16 Jun 2017, 14:09
1
Heisenberg12 wrote:
How does knowing if the female rhinos are shot with tranquilizers for attaching radio collars or not, affect the argument?

After all, we have to find something that evaluates the given conclusion viz. "tranquilizers inhibit fertility."

The conclusion is that some substance in the tranquilizer probably inhibits fertility.

We are comparing two groups of female rhinos: those who have been recollared frequently (and thus tranquilized frequently) and those who are uncollared (we don't know how often this group has been tranquilized). We know that the first group has lower fertility rates. If we somehow knew that the second group was rarely tranquilized, this would support the author's conclusion that the tranquilizer probably inhibits fertility. But if the second group is frequently tranquilized for other reasons, then the author's argument falls apart, and there must be another explanation for the difference in fertility rates.

I hope this helps!
_________________
GMAT/GRE tutor @ www.gmatninja.com (we're hiring!) | GMAT Club Verbal Expert | Instagram | Blog | Bad at PMs

Beginners' guides to GMAT verbal: RC | CR | SC

YouTube LIVE verbal webinars: Series 1: Fundamentals of SC & CR | Series 2: Developing a Winning GMAT Mindset

SC & CR Questions of the Day (QOTDs), featuring expert explanations: All QOTDs | Subscribe via email | RSS

Need an expert reply? Hit the request verbal experts' reply button; be specific about your question, and tag @GMATNinja. Priority is always given to official GMAT questions.

SC articles & resources: How to go from great (760) to incredible (780) on GMAT SC | That "-ing" Word Probably Isn't a Verb | That "-ed" Word Might Not Be a Verb, Either | No-BS Guide to GMAT Idioms | "Being" is not the enemy | WTF is "that" doing in my sentence?

RC, CR, and other articles & resources: All GMAT Ninja articles on GMAT Club | Using LSAT for GMAT CR & RC |7 reasons why your actual GMAT scores don't match your practice test scores | How to get 4 additional "fake" GMAT Prep tests for $29.99 | Time management on verbal
Non-Human User
User avatar
Joined: 01 Oct 2013
Posts: 4765
Re: In a certain wildlife park, park rangers are able to track the movemen  [#permalink]

Show Tags

New post 08 Jan 2019, 05:43
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: In a certain wildlife park, park rangers are able to track the movemen   [#permalink] 08 Jan 2019, 05:43
Display posts from previous: Sort by

In a certain wildlife park, park rangers are able to track the movemen

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne