Find all School-related info fast with the new School-Specific MBA Forum

It is currently 30 Sep 2014, 01:47

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Manatees, aquatic mammals inhabiting Florida s rivers and

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 05 Jan 2008
Posts: 709
Followers: 2

Kudos [?]: 103 [0], given: 0

Manatees, aquatic mammals inhabiting Florida s rivers and [#permalink] New post 27 Apr 2008, 11:05
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:02) correct 0% (00:00) wrong based on 2 sessions
Manatees, 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 manatee-populated waters is being required to maintain very low speeds. Unfortunately, manatees are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boat slows. Therefore, this approach may in fact make things worse rather than better.

Which of the following, if true, casts most doubt on the conclusion?
A. The areas where boats would have to maintain low speeds were decided partly on
the basis of manatee-population estimates and partly from numbers of reported
collisions between manatees and boats.
B. Because the water hyacinth that manatees feed on grows 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 greatest threat to the
endangered manatee population.
D. The sound of a boat engine generally travels much further under water than it
does through the air.

E. When experimenters exposed manatees to the recorded sounds of boats moving at
various speeds, the creatures were unable to discern the sounds over normal
background noise.
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Director
Director
avatar
Joined: 06 Jan 2008
Posts: 560
Followers: 2

Kudos [?]: 101 [0], given: 2

Re: CR: Manatees [#permalink] New post 27 Apr 2008, 11:13
almost went with D..still thinking.
Director
Director
User avatar
Joined: 18 Feb 2008
Posts: 798
Followers: 20

Kudos [?]: 88 [0], given: 25

Re: CR: Manatees [#permalink] New post 27 Apr 2008, 14:07
E. They are unable to discern the sounds, thus the conclusion is invalid.
CEO
CEO
User avatar
Joined: 17 May 2007
Posts: 2995
Followers: 56

Kudos [?]: 438 [0], given: 210

Re: CR: Manatees [#permalink] New post 27 Apr 2008, 22:32
E.
prasannar wrote:
Manatees, 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 manatee-populated waters is being required to maintain very low speeds. Unfortunately, manatees are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boat slows. Therefore, this approach may in fact make things worse rather than better.

Which of the following, if true, casts most doubt on the conclusion?
A. The areas where boats would have to maintain low speeds were decided partly on
the basis of manatee-population estimates and partly from numbers of reported
collisions between manatees and boats.
B. Because the water hyacinth that manatees feed on grows 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 greatest threat to the
endangered manatee population.
D. The sound of a boat engine generally travels much further under water than it
does through the air.

E. When experimenters exposed manatees to the recorded sounds of boats moving at
various speeds, the creatures were unable to discern the sounds over normal
background noise.

Current Student
User avatar
Joined: 17 Jan 2008
Posts: 587
Location: Ann Arbor, MI
Schools: Ross '12 (MBA/MS)
Followers: 1

Kudos [?]: 73 [0], given: 34

Re: CR: Manatees [#permalink] New post 28 Apr 2008, 16:22
E.

The conclusion claims that making boats slow down will make things worse. Since the manatees can't tell the difference between the sounds of slow boats, fast boats, or background noise, the number of manatee-boat collisions should remain the same regardless of boat speed.
_________________

Profile | GMAT | Erb Institute

Senior Manager
Senior Manager
avatar
Joined: 26 Mar 2008
Posts: 341
Location: Washington DC
Followers: 2

Kudos [?]: 29 [0], given: 4

Re: CR: Manatees [#permalink] New post 30 Apr 2008, 11:21
One more for E. As they cant distinguish sounds of boats traveling with different speed.
Whats the OA?
Manager
Manager
User avatar
Joined: 27 Jun 2007
Posts: 200
Followers: 3

Kudos [?]: 11 [0], given: 0

Re: CR: Manatees [#permalink] New post 30 Apr 2008, 11:33
prasannar wrote:
Manatees, 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 manatee-populated waters is being required to maintain very low speeds. Unfortunately, manatees are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boat slows. Therefore, this approach may in fact make things worse rather than better.

Which of the following, if true, casts most doubt on the conclusion?

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

B. Because the water hyacinth that manatees feed on grows 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 greatest threat to the
endangered manatee population.

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

E. When experimenters exposed manatees to the recorded sounds of boats moving at
various speeds, the creatures were unable to discern the sounds over normal
background noise.


I choose E.

I initially eliminated A, B, and C. I was hesitant on D. The conclusion revolves around manatees hearing boat engines under water and not how far engine noise can travel under water vs. air.
Manager
Manager
User avatar
Joined: 19 Aug 2007
Posts: 206
Followers: 1

Kudos [?]: 14 [0], given: 0

Re: CR: Manatees [#permalink] New post 30 Apr 2008, 12:16
E.

If the Manatees can not discern the difference between high and low boat speeds then it should not make the situation worse in this case.
Manager
Manager
avatar
Joined: 16 Jan 2007
Posts: 73
Followers: 1

Kudos [?]: 5 [0], given: 0

Re: CR: Manatees [#permalink] New post 20 May 2008, 11:27
I feel B is right . We need to weeken the argument which states that 'slowing the boat will turn counter productive '.

B addresses the isssue.
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3404
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 162 [0], given: 2

Re: CR: Manatees [#permalink] New post 20 May 2008, 11:36
e is best..says the manatee cant tell the noise of a fast boat either..
Director
Director
User avatar
Joined: 01 Jan 2008
Posts: 513
Followers: 3

Kudos [?]: 45 [0], given: 0

Reviews Badge
Re: CR: Manatees [#permalink] New post 08 Jun 2008, 20:03
Although I havent posted the question , the OA is E. I was to post the same question today,
Re: CR: Manatees   [#permalink] 08 Jun 2008, 20:03
    Similar topics Author Replies Last post
Similar
Topics:
5 Manatees, aquatic mammals inhabiting Florida s rivers and ykaiim 27 19 Jun 2010, 08:25
1 Manatees, aquatic mammals inhabiting Florida s rivers and reply2spg 7 19 Feb 2009, 09:45
Manatees, aquatic mammals inhabiting Florida s rivers and younggun044 7 06 Oct 2007, 18:46
Manatees, aquatic mammals inhabiting Florida s rivers and Jamesk486 6 01 Jun 2007, 08:48
Manatees, aquatic mammals inhabiting Florida s rivers and ttanvir 4 11 Dec 2006, 16:06
Display posts from previous: Sort by

Manatees, aquatic mammals inhabiting Florida s rivers and

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.