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28 Aug 2019, 21:04
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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.
Same stem but different question: https://gmatclub.com/forum/each-year-an ... 03885.html
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.
Same stem but different question: https://gmatclub.com/forum/each-year-an ... 03885.html
29 Aug 2019, 04:49
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Bunuel
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?
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?
Break it down:
Research quantity is getting smaller than commercial
Prethink:
Commercial is getting better at catching
(A) Fishing vessels often exceed their fishing quotas for cod and therefore often underreport the number of tons of cod that they catch.
This doesn't explain the difference between the two
(B) More survey vessels are now involved in the yearly sampling effort than were involved 10 years ago.
Doesn't make a difference if there are more vessels since we are using averages (as per stem)
(C) Improvements in technology over the last 10 years have allowed commercial fishing vessels to locate and catch large schools of cod more easily.
Gives us reason to believe that commercial has an advantage over research.
Good.
(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.
Irrelevant
(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.
If this were true, we would expect the discrepancy between the two to favor research
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03 Jan 2020, 18:24
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Had a different thought process that led to the same outcome, so thought I'd share.
(A) Fishing vessels often exceed their fishing quotas for cod and therefore often underreport the number of tons of cod that they catch.
If they underreport, then how is the estimate derived from fishing vessels increasing? Eliminate.
(B) More survey vessels are now involved in the yearly sampling effort than were involved 10 years ago.
If there are more vessels, then they should theoretically catch more cod, all else equal. Note that while the final estimate is an average, the number of cod caught by research vessels and reported is not an average. In any case, more vessels means larger number of caught cod, which is contrary to the stem. Eliminate.
(C) Improvements in technology over the last 10 years have allowed commercial fishing vessels to locate and catch large schools of cod more easily.
This looks good, keep. Basically implies that the commercial vessels are catching all the cod throughout the year and leave nothing for the research vessels.
(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.
This basically restates a premise. Not useful. Eliminate.
(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.
This makes the discrepancy go the other way - eliminate.
(A) Fishing vessels often exceed their fishing quotas for cod and therefore often underreport the number of tons of cod that they catch.
If they underreport, then how is the estimate derived from fishing vessels increasing? Eliminate.
(B) More survey vessels are now involved in the yearly sampling effort than were involved 10 years ago.
If there are more vessels, then they should theoretically catch more cod, all else equal. Note that while the final estimate is an average, the number of cod caught by research vessels and reported is not an average. In any case, more vessels means larger number of caught cod, which is contrary to the stem. Eliminate.
(C) Improvements in technology over the last 10 years have allowed commercial fishing vessels to locate and catch large schools of cod more easily.
This looks good, keep. Basically implies that the commercial vessels are catching all the cod throughout the year and leave nothing for the research vessels.
(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.
This basically restates a premise. Not useful. Eliminate.
(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.
This makes the discrepancy go the other way - eliminate.
