Frobisher, a sixteenth-century English explorer, had soil : GMAT Critical Reasoning (CR)
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# Frobisher, a sixteenth-century English explorer, had soil

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12 Apr 2011, 01:25
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Frobisher, a sixteenth-century English explorer, had soil samples from Canada’s Kodlunarn Island examined for gold content. Because high gold content was reported,Elizabeth I funded two mining expeditions. Neither expedition found any gold there.
Modern analysis of the island’s soil indicates a very low gold content. Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate. Which of the following is an assumption on which the argument depends?

A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century.
B. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island.
C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.
D. Frobisher did not have soil samples from any other Canadian island examined for gold content.
E. Gold was not added to the soil samples collected by Frobisher before the samples were examined.

Can anyone help in explaining the answer with some good logic?
[Reveal] Spoiler: OA
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12 Apr 2011, 04:10
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Here the conclusion of the agument is that the methods used were wrong
A. since no timelines of Elizabeth's expeditions are given, and in fact it is implied that these were done after Frobisher's exploration - since they were done because of his report only- and since these also didnt find any gold, despite being done in 16th century, Statement A is wrong
B.Weak option - anyway which part of island does modern analysis base itself on - same or not? Since we dont know this, we cant say this is assumption on which the author's argument is based.
C. If methods were different, it doesnt mean they were wrong/ not wrong. incorrect
D. Othe islands are not being talked of here. Incorrect option
E. If frobisher added this gold himself, then both conditions are satisfied- the methods are correct and the soill doesnt have actually any gold. this argument is therefore based on this assumption.
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12 Apr 2011, 10:08
Nicely explained ! Especially the option B.
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12 Apr 2011, 15:18
E
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07 Aug 2011, 02:20
+1 for E
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15 Aug 2011, 08:45
+1 E
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15 Sep 2011, 06:13
vot'E' for E
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15 Sep 2011, 10:39
+1 for E..
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15 Sep 2011, 22:03
IMO ans should be E

For C, we donot have sufficient information to assume whether the method used was different or not, but the use of "modern analysis" indicates that the present day test would be more accurate
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02 Nov 2011, 10:13
E
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02 Nov 2011, 11:36
E
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29 Jan 2012, 03:28
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Frobisher, a sixteenth-century English explorer, had soil samples from Canada’s Kodlunarn Island examined for gold content. Because high gold content was reported,Elizabeth I funded two mining expeditions. Neither expedition found any gold there.
Modern analysis of the island’s soil indicates a very low gold content. Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate. Which of the following is an assumption on which the argument depends?

Conclusion: Methods used by F to find gold content were inaccurate.

A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century. This says that gold content was high in the 16th century. Weakens the argument. Hence, cannot be the assumption.
B. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island.
Irrelevant. Same part or different part not mentioned anywhere in the stimulus.
C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century. The difference in methods does not matter. What the conclusion says is the method, in fact, was inaccurate.
D. Frobisher did not have soil samples from any other Canadian island examined for gold content.Again, irrelevant.
E. Gold was not added to the soil samples collected by Frobisher before the samples were examined. Negating, Gold WAS added to the soil samples before they were examined. If this were true, then F's methods may have been accurate, and measured HIGH GOLD CONTENT. Hence, the conclusion that F's methods were inaccurate falls apart.

Hope this helps
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22 Sep 2014, 04:17
udaymathapati wrote:
Frobisher, a sixteenth-century English explorer, had soil samples from Canada’s Kodlunarn Island examined for gold content. Because high gold content was reported,Elizabeth I funded two mining expeditions. Neither expedition found any gold there.
Modern analysis of the island’s soil indicates a very low gold content. Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate. Which of the following is an assumption on which the argument depends?

A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century.
B. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island.
C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.
D. Frobisher did not have soil samples from any other Canadian island examined for gold content.
E. Gold was not added to the soil samples collected by Frobisher before the samples were examined.

Can anyone help in explaining the answer with some good logic?

This question is asking for assumption. So negation technique will work for true answer choice

If we negates the E, then it breaks the conclusion. Any other choice do not break the conclusion
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17 Nov 2014, 19:31
udaymathapati wrote:
Frobisher, a sixteenth-century English explorer, had soil samples from Canada’s Kodlunarn Island examined for gold content. Because high gold content was reported,Elizabeth I funded two mining expeditions. Neither expedition found any gold there.
Modern analysis of the island’s soil indicates a very low gold content. Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate. Which of the following is an assumption on which the argument depends?

A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century. - If thats the case, then Frob method is correct and Elizabeth 1 should have found some gold. Against the conlusion made by the argument
B. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island. Again against the conclusion made by the argument.
C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century. No way it relates the method used now vs Forb or It should be like 16th century other method saying gold content low while Forb method stating high gold content. Then this will be true.
D. Frobisher did not have soil samples from any other Canadian island examined for gold content. - Clearly stated in the argument that Both soil samples are same
E. Gold was not added to the soil samples collected by Frobisher before the samples were examined. If no gold were added to FORB content, then the conclusion is true. It shows that both of them used the same samples yet FORB concluded for high gold content. yet no gold were found and recent research show for low gold Content

Hence E it is!!!!
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20 Apr 2016, 06:31
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21 Sep 2016, 05:52
I will go with E as well. It is the only one that makes perfect sense...negate E and the whole argument falls apart. If the gold was added intentionally, then it was not the methods that were inaccurate.
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22 Sep 2016, 06:14
udaymathapati wrote:
Frobisher, a sixteenth-century English explorer, had soil samples from Canada’s Kodlunarn Island examined for gold content. Because high gold content was reported,Elizabeth I funded two mining expeditions. Neither expedition found any gold there.
Modern analysis of the island’s soil indicates a very low gold content. Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate. Which of the following is an assumption on which the argument depends?

A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century.
This is no way related to what assumption we need.
B. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island.
If they did not mine the same area, we can say that method used by Frobisher was correct. This goes opposite to our conclusion.
C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.
Out of context, other 16th century scientist are not related here.
D. Frobisher did not have soil samples from any other Canadian island examined for gold content.
Argument already says samples were from a particular island we can not question that.
E. Gold was not added to the soil samples collected by Frobisher before the samples were examined.
perfect, if someone didn't add extra gold in sample and there was no actual gold on island....then Frobisher method was incorrect.

Can anyone help in explaining the answer with some good logic?

We have to give proof that method used by Frobisher was incorrect. In any assumption question that is the basic thing required "we never question assumption, we find information to make fool-proof our assumption". Now what can be underlined assumption to say method was incorrect.
Prethinking:
Samples analyzed by today's scientist and frobisher were exactly the same.
Re: Frobisher, a sixteenth-century English explorer, had soil   [#permalink] 22 Sep 2016, 06:14
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