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Frobisher, a sixteenth-century English explorer, had soil

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Re: CR: gold content [#permalink] New post 21 Dec 2010, 14:46
chelliyil wrote:
Frobisher could have mistakely examined for gold on any other island as well too. In that case D would be a choice. Please explain why this option is out.


You cannot assume information that isn't stated in the question. With the given information, she/he/whoever draws the conclusion that the method was innaccurate.

There are many things that could have happened but only the things mentioned in the text are valid for the argument :)
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Re: CR: gold content [#permalink] New post 21 Dec 2010, 18:05
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chelliyil wrote:
Frobisher could have mistakely examined for gold on any other island as well too. In that case D would be a choice. Please explain why this option is out.


The argument says that he got soil from Kodlunarn island examined. The Queen sent two expeditions there. The argument does not have anything to do with the other islands. It does not assume that he did not get soil of any other island examined. Perhaps he did and found no gold there or perhaps he did find gold there. We do not know and do not care as far as this argument goes. Here we are only concerned with Kodlunarn.
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Re: CR: gold content [#permalink] New post 26 Dec 2010, 12:06
fiesta 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.



Clearly E.
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Re: CR: gold content [#permalink] New post 10 Jan 2011, 08:22
suesie970 wrote:
321kumarsushant wrote:
can anyone please explain why C is not a correct option??
i am agree with C.
E doesn't make sense to me.
can any one tell me, where can i find the correct solution of this question apart from this discussion.?


321kumarsushant:
Option C says that when Frobisher examined the soil sample for gold he used a different method than anyone else was using back in the 1500s . Even if this is true, this statement does not affect the conclusion at all.
If choice C said "The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the twenty first century.", then it would be a contender for the correct answer.
Hope that helps.


E clearly. It's the only one that strays from the original line of the passage.

Susie,

That amendment to option C was a good addition.
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 01 Dec 2011, 23:32
+1 E
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 02 Dec 2011, 19:14
+1 E
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 05 Dec 2011, 01:06
IMO E
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 23 Dec 2011, 05:12
E it is. Nice question but E stands out as the assumption.
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 26 Dec 2011, 02:32
Yes E its very simple.

We need to SUPPORT the assumption that METHOD USED TO TEST GOLD CONTENT was inaccurate.
E ) clearly states that Sample was not wrong and no gold was added to the sample .. so he had sample which had no gold yet his study showed gold was present
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 29 Nov 2012, 11:23
It's been assumed that the method was wrong considering no gold was added.
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Re: CR: gold content [#permalink] New post 25 Nov 2013, 16:57
Hey Karishma,

But why not D?

Thanks


VeritasPrepKarishma wrote:
fiesta 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.


Let us read the question stem first. We are looking for an assumption. An assumption is a necessary missing premise. We are looking for the option that needs to be true for the conclusion to be true.

Premises:
Frobisher 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.

Tell me, when you read the above premises, what possibilities come to mind? Frobisher had samples examined. High gold content was reported. No gold was actually found. Modern analysis show very low gold content.

The following possibilities come to my mind:
1. Either there was gold and before the expeditions were sent, it was mined (very unlikely!)
2. His methods were inaccurate.
3. Someone had added gold to the soil he tested.

Conclusion:
The methods used to determine the gold content of Frobisher’s samples must have been inaccurate.

If I am concluding that his methods were inaccurate, then I am assuming that no one added gold to his samples and gold was not mined before the expeditions were sent. (Technically, gold could have been added and his methods could have been inaccurate too but lets not mess with that.)
Hence option (E) is an assumption.
Also, use you can use assumption negation technique to see that it is the right answer.
I negate (E) : Gold was added to the soil samples collected by Frobisher before the samples were examined.

I can not conclude now that his methods were inaccurate.
Hence (E) is the correct answer.

Option (C) is not correct. We did not assume in the argument that his methods were different. They could have been the same ones generally used in the 16th century, It is possible that 16th century methods were not accurate.
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Re: CR: gold content [#permalink] New post 27 Nov 2013, 22:42
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Shibs wrote:
Hey Karishma,

But why not D?

Thanks


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Re: CR: gold content [#permalink] New post 28 Nov 2013, 01:57
How could D be a choice?

Negate D and check.

Frobisher has soil samples from other Canadian island examined for gold content.

Even though he has examined soil samples from other islands, his method could still be inaccurate. Thus D would not hurt the conclusion by negation.

Answer is E.
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Re: Frobisher, a sixteenth-century English explorer, had soil [#permalink] New post 03 Dec 2013, 06:08
Look at 5 choices:

A) Doesn't support the conclusion: lower gold content today suggests that finding low gold content doesn't imply the inaccuracy of the method.

B) Same as A: "didn't mine the same part" => cannot conclude anything about the method's accuracy

C) out of scope: "the method generally used in the 16th century" is irrelevant. Such a comparison between 2 methods provides no help.

D) The statement is not enough for us to establish any inference about the method mentioned in the original argument

E) Using negation technique: What happens if this stat isn't true? As gold was added to the samples before they were checked, the reported high gold content is due to fraudulence (my own idea!), rather than the method's inaccuracy => invalidate the conclusion.

Pick E.
Re: Frobisher, a sixteenth-century English explorer, had soil   [#permalink] 03 Dec 2013, 06:08
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