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# Capuchin monkeys in Venezuela often rub a certain type of

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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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22 May 2014, 23:11
egmat wrote:
Nitinaka19 wrote:
Hi,

I took this argument in a causative fashion, where conclusion says , Rubbing of Milipeds leads to Protection against Mosquitoes, So X leads to Y . Cant a alternate cause could be possible answer to this question,which is mention in option E.

Please correct me where I'm wrong?

Thanks

Hi Nitin,

If you thought that the argument here is "X leads to Y", then you shouldn't have marked an alternate cause as a weakener.

Please visit this article to understand where an alternate cause is a weakener and where it is not

alternate-cause-a-weakener-or-not-155034.html#p1240789

Thanks,
Chiranjeev

Can we conclude that if an additional premise states that monkeys use ONLY the mills on the fur...then E could be a potential answer..
We now know that we have other potential sources of repellents but the monkeys use ONLY the mills..so it must be for some other additional reasons like..personal liking or availability..
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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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23 May 2014, 00:00
Ohh i Got it ,the conclusion falls under the category where the even is likely to happen ,that means alternative cause cant be weakener.

Thanks

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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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23 May 2014, 00:28
Hi ,

One thing more i need to clarify here is i'm not able to apply the variance test in option D.

D. Whether the only time millipedes are readily available to capuchins is during rainy season
Saying Yes ,means due to readily availablity of milipeds during rainy season would strengthen the argument as they are rubbing to protech from mosiquotoes.

And Saying No, means they are available all the time ,so this would weaken the argument as Monkey rubbing could be for some other purpose or this would weaken the argument as Monkey can rub the millipeds not especially rainy time.

So my confusion is while saying no to option D, how does it weaken the argument.

Thanks

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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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23 May 2014, 21:49
egmat wrote:
Nitinaka19 wrote:
Hi,

I took this argument in a causative fashion, where conclusion says , Rubbing of Milipeds leads to Protection against Mosquitoes, So X leads to Y . Cant a alternate cause could be possible answer to this question,which is mention in option E.

Please correct me where I'm wrong?

Thanks

Hi Nitin,

If you thought that the argument here is "X leads to Y", then you shouldn't have marked an alternate cause as a weakener.

Please visit this article to understand where an alternate cause is a weakener and where it is not

alternate-cause-a-weakener-or-not-155034.html#p1240789

Thanks,
Chiranjeev

Hi Chiranjeev,

Can I apply variance test on this?

Can you please let me know how variance test can be applied on this?
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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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01 Jun 2014, 20:21
Quote:
Hi ,

One thing more i need to clarify here is i'm not able to apply the variance test in option D.

D. Whether the only time millipedes are readily available to capuchins is during rainy season
Saying Yes ,means due to readily availablity of milipeds during rainy season would strengthen the argument as they are rubbing to protech from mosiquotoes.

And Saying No, means they are available all the time ,so this would weaken the argument as Monkey rubbing could be for some other purpose or this would weaken the argument as Monkey can rub the millipeds not especially rainy time.

So my confusion is while saying no to option D, how does it weaken the argument.

Thanks

Hi Nitin,

Here is my bit on this:

Your idea of applying variance test seems good i.e. you seem to know that the variance test when applied to the correct choice here will yield two answers: Yes and No. One of these answers will increase your belief in the conclusion and the other will decrease the same. However, your application of the test isn't correct. In fact, you've interpreted the effect of the variance test in an opposite manner here. To understand the same, please consider the following:

The conclusion is drawn regarding the rubbing behavior of these monkeys in a specific season. The author says that they do so because it helps protect these monkeys against the mosquitoes since this behaviour is rare except in the rainy season when the mosquito populations are at their peak. Our job in this question is to find one answer choice that will yield information helpful in evaluating the proposed argument. Accordingly, let's look at option D

D. Whether the only time millipedes are readily available to capuchins is during rainy season

If yes- Rainy season is the only time millipedes are readily available.

As you have rightly pointed out, this choice talks about the availability of millipedes. If the answer to this question is Yes, the only time millipedes are readily available to capuchins is during rainy season then our belief in the argument is decreased. If millipedes are available to these monkeys only in the rainy season, then they can't rub them in other seasons. In other words, the non-availability of millipedes in other seasons may limit the rubbing behaviour of monkeys to only rainy season. This information suggests that they don't have a 'choice'. Hence, in this case, rubbing behavior may not be linked with the increase in the mosquito population during the rainy season Thus, a “yes” to the question posed in choice D weakens the conclusion that protection against mosquitoes is the only reason for rubbing behavior in rainy season.

Quote:

And Saying No, means they are available all the time ,so this would weaken the argument as Monkey rubbing could be for some other purpose or this would weaken the argument as Monkey can rub the millipeds not especially rainy time.

So my confusion is while saying no to option D, how does it weaken the argument.

Thanks

If No- Rainy season is NOT the only time millipedes are readily available.

Now, we move on to the other end of the spectrum. This time we answer the question by saying No rainy season is not the only time when the millipedes are readily available to these monkeys. Together with the information given in the passage, we know that even though the millipedes are easily available in other seasons, the rubbing behaviour of these monkeys is rare except in rainy season when mosquito population is at peak. This information suggests that the monkeys choose to rub millipedes during a specific time period, increasing our belief in the conclusion that monkeys probably rub millipedes into their fur only because doing so helps protect them against mosquitoes.

In all, when we apply the Variance test to choice D, a 'yes' weakens the argument and a ‘no’ strengthens the same.

Does this help?

Dolly.
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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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30 Nov 2014, 19:42
Argument says that the reasons monkey rub millepede is due to protect themselves from mosquitoes during rainy season. D if answered Yes/No will make or break the conclusion.

quiet888 wrote:
Capuchin monkeys in Venezuela often rub a certain type of millepede into their fur. Secretions of these millipedes have been shown to contain two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate the capuchins. The rubbing behavior is rare except during the rainy season, when mosquito populations are at their peak. Therefore monkeys probably rub millipedes into their fur only because doing so helps protect them against mosquitoes.
Which of the following would be most useful to determine in order to evaluate the argument.

A) Whether the two chemicals provide any protection for millipedes against their own repellents.
B) Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world.
C) Whether animals other than capuchins rub insects of any kind into their fur
D) Whether the only time millipedes are readily available to capuchins is during rainy season
E) Whether secretions of any other insects accessible to capuchins contain chemicals that repel the mosquitoes"

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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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16 Jan 2015, 21:08
I chose E...if there are other insects that can do the same thing, then there has to be another reason (even if it is sub-conscious)

Key word is "only"

Therefore monkeys probably rub millipedes into their fur onlybecause doing so helps protect them against mosquitoes.
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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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23 May 2015, 06:41
D can only be the possible answer.....

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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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17 May 2016, 11:18
quiet888 wrote:
Capuchin monkeys in Venezuela often rub a certain type of millepede into their fur. Secretions of these millipedes have been shown to contain two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate the capuchins. The rubbing behavior is rare except during the rainy season, when mosquito populations are at their peak. Therefore monkeys probably rub millipedes into their fur only because doing so helps protect them against mosquitoes.
Which of the following would be most useful to determine in order to evaluate the argument.

A) Whether the two chemicals provide any protection for millipedes against their own repellents.
B) Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world.
C) Whether animals other than capuchins rub insects of any kind into their fur
D) Whether the only time millipedes are readily available to capuchins is during rainy season
E) Whether secretions of any other insects accessible to capuchins contain chemicals that repel the mosquitoes"

For me, the key to solve CR questions is to put myself in the argument. And, it doesn't harm to think of myself as Capuchin monkey to get the answer right

The argument concludes that CM rubs millepedes into its fur to protect against mosquitos. This behavior of rubbing is rare in seasons other than rainy season, when mosquitos are at the peak.

A) Whether the two chemicals provide any protection for millipedes against their own repellents. We are looking for an option that shows weather CM rubs millepedes to protect against mosquitos.
B) Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world. It does'nt matter
C) Whether animals other than capuchins rub insects of any kind into their fur. We are concerned about CM
D) Whether the only time millipedes are readily available to capuchins is during rainy season. We got it! what if millepedes are available readily only during rainy season. Then CM gets to rub millipedes frequently during rainy season only. Availability can be the reason that CM rubs millipedes and not the mosquito presence. Or it could be to repel mosquito
E) Whether secretions of any other insects accessible to capuchins contain chemicals that repel the mosquitoes. Not concerned about other insects.
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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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30 Jun 2016, 11:55
Capuchins rub millipedes that secrete mosquito repellants.
Rubbing happens in rainy season when mosquitos are high in number

Conclusion: Hence rubbing is done to protect against mosquitos.
We need to evaluate this conclusion.

Of the given options, only D talks about an alternate reason of rubbing of millipedes.
Option E talks about some other way in which the capuchins can ward of insects. Great, now they have two ways. But this does not hinder the capuchins from using millipedes as well. Hence this is out of scope.

Correct Option: D
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Re: Capuchin monkeys in Venezuela often rub a certain type of [#permalink]

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14 Aug 2017, 11:15
Capuchin monkeys in Venezuela often rub a certain type of millepede into their fur. Secretions of these millipedes have been shown to contain two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate the capuchins. The rubbing behavior is rare except during the rainy season, when mosquito populations are at their peak. Therefore monkeys probably rub millipedes into their fur only because doing so helps protect them against mosquitoes.
Which of the following would be most useful to determine in order to evaluate the argument.

A) Whether the two chemicals provide any protection for millipedes against their own repellents. -Argument is about monekys
B) Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world. -We are not worried about the various places where we can find them
C) Whether animals other than capuchins rub insects of any kind into their fur -We are not worried about other animals
D) Whether the only time millipedes are readily available to capuchins is during rainy season -CORRECT
E) Whether secretions of any other insects accessible to capuchins contain chemicals that repel the mosquitoes We are not worried about other insects
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Re: Capuchin monkeys in Venezuela often rub a certain type of   [#permalink] 14 Aug 2017, 11:15

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