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XYZ, aquatic mammals inhabiting Florida s rivers and coastal

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XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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26 Jul 2011, 07:04
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XYZ, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats. To address the problem, boat traffic in XYZ-populated waters is being required to maintain very low speeds. Unfortunately, XYZs are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boats slows. Therefore, this approach may in fact make things worse rather than better.

Question) Which of the following if true would strengthen the conclusion?

a) The areas where boats would have to maintain low speeds were decided partly on the basis of XYZ-population estimates and partly from numbers of reported collisions between XYZ and boats.

b) Because the water hyacinth that XYZ feed on grow best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-moving boat traffic.

c) Over the last several decades, boat traffic in Florida’s coastal waters has been increasing almost continuously and now represents the greater threat to the endangered XYZ population.

d) The sound of a boat engine generally travels much further under water than it does through the air.

e) When experimenters exposed XYZs to the recorded sounds of boats moving at various speeds, the creature were unable to discern the sounds over normal background noise.
[Reveal] Spoiler: OA
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26 Jul 2011, 10:08
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Answer is E , explained below :
UtterNonsense wrote:
XYZ, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats. To address the problem, boat traffic in XYZ-populated waters is being required to maintain very low speeds. Unfortunately, XYZs are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boats slows. Therefore, this approach may in fact make things worse rather than better.

Question) [b]Which of the following if true would strengthen the conclusion?[/b]

Answer should essentially hint/provide evidence that low speed boats are not effective

a) The areas where boats would have to maintain low speeds were decided partly on the basis of XYZ-population estimates and partly from numbers of reported collisions between XYZ and boats.
Ok..but this does not address the low speed collision problem in anyway.Eliminate

b) Because the water hyacinth that XYZ feed on grow best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-moving boat traffic.
Irrelevant.Eliminate

c) Over the last several decades, boat traffic in Florida’s coastal waters has been increasing almost continuously and now represents the greater threat to the endangered XYZ population.

d) The sound of a boat engine generally travels much further under water than it does through the air.
Irrelevant fact . fast as well as slow boat engine's sounds will travel much further under water.Eliminate

e) When experimenters exposed XYZs to the recorded sounds of boats moving at various speeds, the creature were unable to discern the sounds over normal background noise.
Bingo ! since XYZ cannot discern the boat sounds over normal background noise of boats moving at various speeds,low boat speed law doesn't really affect the collisions issue as it doesn't matter if the boats are traveling fast or slow.
XYZ are not able to discren the boat sound regardless of the speed is the key here .

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26 Jul 2011, 13:28
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^^^ you are right . the conclusion for the arguments is "this approach may in fact make things worse rather than better"
E doesn't necessarily make things worse but thats the only one in the answer choices that is very close to the expected option.
none of the other answer choices even fit the argument
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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15 Mar 2012, 14:17
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What I like about CR is the feeling of sudden awareness that an answer choice is correct; everything just clicks into place.

With this question, there were no clicks. In fact, I found (E) to be WEAKENING the conclusion. Of course no other answer choices worked, but we can't work by default here, and choose the answer choice that is most relevant to the prompt (in this case (E).

But just to run a little experiment, let me argue for (E) to illustrate what I must do in order to make this answer choice work.

(E) says that XYZ cannot tell the difference between low-pitched and high-pitched sounds. But a slow boat spends more time moving across a body of water, so that gives XYZ more time to collide with it. Therefore, slow boats are more dangerous.

That answer may seem sensible, but I am doing a few things you should never do on GMAT Critical Reasoning. First off, I am discounting part of the conclusion, which states: slow boats are more dangerous to XYZ than are fast boats, because XYZ cannot hear slow boats.

Secondly, I am making some inferences that are not backed up by the passage (and indeed may not be backed up by reality). Namely, that XYZ is more likely to collide with a slow moving object.

Here nothing is "clicking into place," and I have to really labor to come up with an answer. The less straightforward the reasoning the more likely the given answer choice is wrong.

So it is only by breaking rules fundamental to GMAT that I can conceivably make (E) work. So (E) is definitely NOT the answer

The question--which I like, besides the prosaic tag XYZ (couldn't we just say hu-manatee)--is therefore broken. To fix it, all we would need to do is to add the word WEAKEN to the question. As in:

Which one of the following would WEAKEN the conclusion.

Then, the answer is clearly (E). The conclusion states that XYZ is likely to hear low-pitch than high pitch. (E) says that XYZ is unable to determine the difference).

So again, there is NO ANSWER to the question. It is faulty, but can easily be emended by the addition of one word.
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Last edited by ChrisLele on 19 Mar 2012, 18:57, edited 2 times in total.
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26 Jul 2011, 09:22
Good question, I got it wrong but E does make the most sense.
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26 Jul 2011, 09:31
Yeah E makes most sense but I was hoping if someone could provide an explanation
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26 Jul 2011, 10:40
Zynga wrote:
Answer is E , explained below :
XYZ, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats. To address the problem, boat traffic in XYZ-populated waters is being required to maintain very low speeds. Unfortunately, XYZs are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boats slows. Therefore, this approach may in fact make things worse rather than better.

Question) [b]Which of the following if true would strengthen the conclusion?[/b]

Answer should essentially hint/provide evidence that low speed boats are not effective
e) When experimenters exposed XYZs to the recorded sounds of boats moving at various speeds, the creature were unable to discern the sounds over normal background noise.
Bingo ! since XYZ cannot discern the boat sounds over normal background noise of boats moving at various speeds,low boat speed law doesn't really affect the collisions issue as it doesn't matter if the boats are traveling fast or slow.
XYZ are not able to discren the boat sound regardless of the speed is the key here .

[/quote]

As you pointed out that this approach [slow boats] would make situation worse rather than improve it so if the mammal are not able to distinguish than slow boats are as bad as fast boats so it doesn't really effect [as you mentioned the answer should be] but since it doesn't effect then it would mean that it just wouldn't improve the situation. Is that what we are looking for in the answer - since no change in situation so he it doesn't improve it hence it does the opposite i.e. makes it worse?
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26 Jul 2011, 12:52
certainly a tough one, I understand that we are making the speed irrelevant, but is the conclusion not "Therefore, this approach may in fact make things worse rather than better." So strengthening this argument would mean that the approach will make things worse than better? I get E is the right answer I'm not arguing that but I guess my concern is what am I missing about the conclusion rather then the answer
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26 Jul 2011, 17:37
ahh i see i guess that makes sense! thanks, kudos!
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07 Aug 2011, 03:10
good explanation !!!
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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29 Jan 2012, 21:32
If XYZs can't differentiate between low speed and high speed, I can't understand how having low speeds will make it worse. None of the options sound good. Pl. help
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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30 Jan 2012, 08:34
Exactly nikhilsamuel89 .If the XYZ is unable to distinguish between low and high speed .It does not matter at what speed the boats are travelling .Someone pls give a valid explanation .
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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03 Feb 2012, 04:28
+ 1 E

Just used process of elimination & double checked
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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03 Feb 2012, 14:25
I chose option E but didn't liked the grammar in it.

"When experimenters exposed XYZs to the recorded sounds of boats moving at various speeds, the creature were unable to discern the sounds over normal background noise. "

creature is singular; why does the sentence uses plurel were?
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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04 Feb 2012, 09:13
saikarthikreddy wrote:
Exactly nikhilsamuel89 .If the XYZ is unable to distinguish between low and high speed .It does not matter at what speed the boats are travelling .Someone pls give a valid explanation .

Hi,

Option E is the one which perfectly weakens the argument. I guess someone might have flipped the question here..
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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06 Feb 2012, 06:05
UtterNonsense wrote:
XYZ, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats. To address the problem, boat traffic in XYZ-populated waters is being required to maintain very low speeds. Unfortunately, XYZs are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boats slows. Therefore, this approach may in fact make things worse rather than better.

Question) Which of the following if true would strengthen the conclusion?

premise : xyz swims close to water surface and are frequently killed by collision with speed boat
premise :XYZs are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boats slows

conclusion : the approach of maintaining low speed is making problem of collision is actually worse

thus a strengthener would either
1. provide an evidence or support that event that additional support to prove conclusion ( slow speed doesn't prevent collision)
or 2. it would close/negate any alternate reason for collision. (may be suicidal tendency of xyz is infact the cause )

let's search out for any of these in answers

a) The areas where boats would have to maintain low speeds were decided partly on the basis of XYZ-population estimates and partly from numbers of reported collisions between XYZ and boats. [color=#800080] even if areas were determined using this logic, it does not provide any support to the theory tht low speeds doesn't help in solving of collision. Out of scope

b) Because the water hyacinth that XYZ feed on grow best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-moving boat traffic. this option is again out of scope, thou it may be helpful in increasing the population of xyz , but our stimulus is manily concerned with accident btw xyz and slow moving boats.

c) Over the last several decades, boat traffic in Florida’s coastal waters has been increasing almost continuously and now represents the greater threat to the endangered XYZ population. again same as B. it does not address the issue of collision btw slow moving boats n xyz

d) The sound of a boat engine generally travels much further under water than it does through the air. out of scope we are concerned with pitch of sound rather than its speed

e) When experimenters exposed XYZs to the recorded sounds of boats moving at various speeds, the creature were unable to discern the sounds over normal background noise if xyz cannot distinguish btw various boat sounds over background noise, then it doesn't make any difference if boat travels slower or faster. hence it doesn't destroy conclusion Although slow speed doesn't make matter worse but it doesn't improve it either.

Hence out of all the choices only one which comes close by is E [/color]
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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07 Feb 2012, 04:16
Option E sounds good.
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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07 Feb 2012, 18:55
e) When experimenters exposed XYZs to the recorded sounds of boats moving at various speeds, the creature were unable to discern the sounds over normal background noise.

Option E ties a new evidence to the conclusion that the XYZs can't differentiate the sounds over the normal noise (Something which may be present in the waters).
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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18 Feb 2012, 00:56
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Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal [#permalink]

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07 Mar 2012, 16:49
shahideh wrote:

the same question
stem assumes that XYZ does hear the noise from fast-speed boat
E says that it's not true
so E can't be correct
Re: XYZ, aquatic mammals inhabiting Florida s rivers and coastal   [#permalink] 07 Mar 2012, 16:49

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