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28 Aug 2019, 21:03
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
43% (02:51) correct
57%
(02:39)
wrong
based on 297
sessions
History
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Not Attempted Yet
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.
If the statements in the passage are true, which one of the following is most strongly supported by them?
(A) Last year's official estimate was probably not much different from the official estimate ten years ago.
(B) The number of commercial vessels fishing for cod in the Grand Banks has increased substantially over the past decade.
(C) The sampling-based estimate is more accurate than the estimate based on commercial tonnage in that the data on which it relies is less likely to be inaccurate.
(D) The once-yearly sampling by research vessels should be used as the sole basis for arriving at the official estimate of the stock of cod.
(E) Twenty years ago, the overall stock of cod in the Grand Banks was officially estimated to be much larger than it is estimated to be today.
Same stem but different question: https://gmatclub.com/forum/each-year-an ... 03886.html
If the statements in the passage are true, which one of the following is most strongly supported by them?
(A) Last year's official estimate was probably not much different from the official estimate ten years ago.
(B) The number of commercial vessels fishing for cod in the Grand Banks has increased substantially over the past decade.
(C) The sampling-based estimate is more accurate than the estimate based on commercial tonnage in that the data on which it relies is less likely to be inaccurate.
(D) The once-yearly sampling by research vessels should be used as the sole basis for arriving at the official estimate of the stock of cod.
(E) Twenty years ago, the overall stock of cod in the Grand Banks was officially estimated to be much larger than it is estimated to be today.
Same stem but different question: https://gmatclub.com/forum/each-year-an ... 03886.html
09 Sep 2019, 02:04
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The clue to solving this question lies in the last statement provided. Which states that “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”.
Let the sampling based estimate ten years ago be y and estimate based on commercial tonnage 10 years ago be x.
From the statement above, if x increased by 10, then y decreased by 10 as well.
We already know from earlier argument that the yearly estimate is based on average of estimate based on commercial tonnage (x), and estimate based on sampling once in a year (y).
So in this case average will still be same since
Average= (x+10+y-10)/2 = (x+y)/2
This is clearly stated in option A, that last year’s official estimate was probably not much different from official estimate ten years ago. A is therefore the answer which most strongly support the arguments made in the question stem.
B is irrelevant because if the number of commercial fishing vessels for cod have gone up over the past decade, and yet the estimates based on commercial yield keeps going up, it only means that there is enough cod in the Grand Banks per unit fishing effort.
C is incorrect because nothing in the question stem suggests that the sampling based estimate is more accurate than the estimate based on commercial tonnage.
D is also incorrect because nothing in the argument shows that the estimate by commercial tonnage is not accurate hence sole reliance on estimate by sampling. This is because the data trend shows that the official estimate of cod has remained the same.
E is not necessarily true. This is because nothing in the question stem suggests that the stock of cod was higher twenty years ago than it is today.
Posted from my mobile device
Let the sampling based estimate ten years ago be y and estimate based on commercial tonnage 10 years ago be x.
From the statement above, if x increased by 10, then y decreased by 10 as well.
We already know from earlier argument that the yearly estimate is based on average of estimate based on commercial tonnage (x), and estimate based on sampling once in a year (y).
So in this case average will still be same since
Average= (x+10+y-10)/2 = (x+y)/2
This is clearly stated in option A, that last year’s official estimate was probably not much different from official estimate ten years ago. A is therefore the answer which most strongly support the arguments made in the question stem.
B is irrelevant because if the number of commercial fishing vessels for cod have gone up over the past decade, and yet the estimates based on commercial yield keeps going up, it only means that there is enough cod in the Grand Banks per unit fishing effort.
C is incorrect because nothing in the question stem suggests that the sampling based estimate is more accurate than the estimate based on commercial tonnage.
D is also incorrect because nothing in the argument shows that the estimate by commercial tonnage is not accurate hence sole reliance on estimate by sampling. This is because the data trend shows that the official estimate of cod has remained the same.
E is not necessarily true. This is because nothing in the question stem suggests that the stock of cod was higher twenty years ago than it is today.
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22 Apr 2021, 23:21
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Bunuel
1. "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."
2. "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"
From these above statements, we can very well infer that last year's estimate was, probably, similar to the estimate made a decade ago.
Option (A) tells exactly the same !
(A) Last year's official estimate was probably not much different from the official estimate ten years ago.
A is the correct answer.
