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# Each year, an official estimate of the stock of cod in the

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Each year, an official estimate of the stock of cod in the [#permalink]

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10 Aug 2010, 06:44
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Difficulty:

65% (hard)

Question Stats:

61% (02:22) correct 39% (02:49) wrong based on 88 sessions

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Each year, an official estimate of the stock of cod in the Grand Banks is announced. This estimate is obtained by averaging two separate estimates of how many cod are available, one based on the number of cod caught by research vessels during a once-yearly sampling of the area and the other on the average number of tons of cod caught by various commercial vessels per unit of fishing effort expended there in the past year—a unit of fishing effort being one kilometer of net set out in the water for one hour. In previous decades, the two estimates usually agreed closely. However, for the last decade the estimate based on commercial tonnage has been increasing markedly, by about the same amount as the sampling-based estimate has been decreasing.

Which one of the following, if true, most helps to account for the growing discrepancy between the estimate based on commercial tonnage and the research-based estimate?
(A) Fishing vessels often exceed their fishing quotas for cod and therefore often underreport the number of tons of cod that they catch.
(B) More survey vessels are now involved in the yearly sampling effort than were involved 10 years ago.
(C) Improvements in technology over the last 10 years have allowed commercial fishing vessels to locate and catch large schools of cod more easily.
(D) Survey vessels count only those cod caught during a 30-day survey period, whereas commercial dishing vessels report all cod caught during the course of a year.
(E) Because of past overfishing of cod, fewer fishing vessels now catch the maximum tonnage of cod each vessel is allowed by law to catch.

I negated C because it says only about the commercial fishing data while nothing has been mentioned about the research fishing data. It might be possible that the Improvements in technology ( Or any other reason ) also helped research vessels to catch large schools of cod.
[Reveal] Spoiler: OA

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10 Aug 2010, 06:55
I narrowed to A and C but picked A because if commerical fishing vessels underreport the number of tons of cod caught by them then the estimates of stock of cod available will be high. That is why the estimates are high from commercial vessels and the estimates are low from reaserch vessels.

can someone explain why A is incorrect?

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10 Aug 2010, 06:59
@Seekmba ..

We should not assume that the commerical fishing vessels underreport the number of tons of cod caught by them as its not mentioned in option A. Its says Fishing vessels which can be both Research as well as Commercial. Hope this helps.

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10 Aug 2010, 07:26
thank you rohitgoel15. got it. i didnt read it properly.

a slight loss of attention and we pay the price in gmat....

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10 Aug 2010, 07:39

the average number of tons of cod caught by various commercial vessels per unit of fishing effort expended there in the past year—a unit of fishing effort being one kilometer of net set out in the water for one hour

Better tech. will inc. the no. of cods caught

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10 Aug 2010, 09:08
Nice question. C seems to be correct.

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10 Aug 2010, 09:16
What is the OA?

Posted from my mobile device
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11 Aug 2010, 03:04
C it is

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12 Aug 2010, 00:12

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12 Aug 2010, 08:36
rohitgoel15 wrote:

I negated C because it says only about the commercial fishing data while nothing has been mentioned about the research fishing data. It might be possible that the Improvements in technology ( Or any other reason ) also helped research vessels to catch large schools of cod.

I arrived at C mostly based on POE, C is a big contender for me but does not quite satisfy me, but since every other answers is incorrect, C it is.

C explicitly said that the technology improve the commercial fishing to catch more fish, and since we are looking for the answer that "most helps" to explain the difference, we can entirely assume that only the commercial apply the new technology and the Research doesn't.

With this the discrepancy is explained as:

In the sea: there are 100 cods, before, the commercial catch 50, the research catch 50, now, the commercial catch 70 (+20), due to the lack of cods available, the research could only catch 30 (-20).

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12 Aug 2010, 08:49
A is incorrect as this answer choice makes the argument even more confusing than flawless. the fact that commercial vessels catch even more fish than they actually report does not explain why the research vessels catch less. If it were vice versa, so that research vessels underreport instead than thids answer choice would be very close to fill in the logical gap and be a correct answer.
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Re: Each year, an official estimate of the stock of cod in the [#permalink]

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09 Oct 2015, 02:46
I picked C by POE.
here goes my reasoning- So commercial vessels are catching more cods for some reason or research are catching less or both
A- weakens, cause it talks about commercial under-reporting- if they under report then their catch number must be higher, difference should only increase. This would not help. Eliminate A
B- More Survey vessels- this should mean more cods number for them but thats not the case. Eliminate B.
C- New technology allows Commercial to catch more-- ok. Would explain their hike. Keep C. Lets see if any other explains Commercial and Survey case.
D- Ok explains both, but doesn't make sense cause if i were to average something i would need apples and apples not apples and oranges. So yea it explains the reason of count difference but based on day factor. Complicated reasoning and to my reasoning average of both would be totally wrong. Eliminate D
E- Fewer Commercial vessels- no way. Eliminate E.

So basically left with C, (i did waver at D but after re-reading it found it doesn't hold against C)

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Re: Each year, an official estimate of the stock of cod in the   [#permalink] 09 Oct 2015, 02:46
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