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# The popular notion that a tree's age can be determined by

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Re: The popular notion that a tree's age can be determined by [#permalink]

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20 Sep 2011, 22:20
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IMO E

hogann wrote:
The popular notion that a tree's age can be determined by counting the number of internal rings in its trunk is generally true. However, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit will its rings be a reliable measure of the tree's age.

Which of the following is an assumption on which the argument above depends?

A. The growth of new rings in a tree is not a function of levels of precipitation. - out of scope to some extent as we are not given any information on precipitation. INCORRECT
B. Only the Brazilian ash loses rings because of excessive heat. - So what?? Anyways we are supposed to talk about brazilian ash tree only. INCORRECT
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring.- again I would ask the same question - so what?? We are not concerned about for how much time certain temperature must remain rather we are concerned about the relationship between the temperature and the loss of rings. INCORRECT
D. The internal rings of all trees are of uniform thickness. - again out of scope. INCORRECT
E. The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable - An assumption is something which makes an argument complete. If the assumption were absent, the argument will fall apart. Here the conclusion is that only if temperature never exceeds 95 degrees, the age of tree will be predictable. What if the temperature also increases and still we are able to predict the age. The conclusion will not hold true in that case. Hence CORRECT

OA to come

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Re: The popular notion that a tree's age can be determined by [#permalink]

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27 Sep 2011, 09:00
hogann wrote:
The popular notion that a tree's age can be determined by counting the number of internal rings in its trunk is generally true. However, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit will its rings be a reliable measure of the tree's age.

Which of the following is an assumption on which the argument above depends?

A. The growth of new rings in a tree is not a function of levels of precipitation.
B. Only the Brazilian ash loses rings because of excessive heat.
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring.
D. The internal rings of all trees are of uniform thickness.
E. The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable

OA to come

OA is E
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Re: The popular notion that a tree's age can be determined by [#permalink]

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02 Nov 2011, 00:08
last sentence of the argument doesnt sound correct to me.

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The popular notion that a tree s age can be determined by [#permalink]

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24 Nov 2011, 01:53
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The popular notion that a tree’s age can be determined by counting the
number of internal rings in its trunk is generally true. However, to help
regulate the internal temperature of the tree, the outermost layers of wood
of the Brazilian ash often peel away when the temperature exceeds 95
degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise
have. So only if the temperature in the Brazilian ash’s environment never
exceeds 95 degrees Fahrenheit will its rings be a reliable measure of the
tree’s age.

Which of the following is an assumption on which the argument
above depends?

A. The growth of new rings in a tree is not a function of levels of precipitation.
B. Only the Brazilian ash loses rings because of excessive heat.
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to
cause the Brazilian ash to lose a ring.
D. The internal rings of all trees are of uniform thickness.
E. The number of rings that will be lost when the temperature exceeds 95
degrees Fahrenheit is not predictable.

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Re: CR 700 level question [#permalink]

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24 Nov 2011, 15:38
E it is because the conclusion will fall apart when you negate this option.
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Re: CR 700 level question [#permalink]

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24 Nov 2011, 19:22
Hey can you explain why not C ?
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Re: CR 700 level question [#permalink]

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24 Nov 2011, 21:58
ksp, i think you should go to sc doc by whiplash2411(very nice!) in the following link cr-master-thread-101977.html specially --The Bang, Bang CR Guide - whiplash2411.

well, this doc. explains what is called a building a SHELL. This is what is exactly a shell. giving you some added nice information with respect to the premise. But this is wrong.

E is clearly the assumption here.

(p.s: sad but true, i too originally went for C, sometime these rules are hard to keep in mind and answers choices are very deviating)

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Re: CR 700 level question [#permalink]

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24 Nov 2011, 23:20
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Really a tough one.. (E) indeed is the correct ans..
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Re: CR 700 level question [#permalink]

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25 Nov 2011, 04:34
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IMO E,

The number of rings that will be lost when the temperature exceeds 95
degrees Fahrenheit is not predictable- If the count of the rings lost due to high temp was know, then it would be easy to predict the age of the tree.

Clearly E.

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Re: CR 700 level question [#permalink]

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13 Dec 2011, 01:50
Conclusion: So only if the temperature in the Brazilian ash’s environment never exceeds 95 degrees Fahrenheit will its rings be a reliable measure of the tree’s age.

C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring. => Negate, does not whether the counting rings is a reliable measure of the tree's age
E. The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable.=> Negate, Attack the counting rings method is a reliable measure of the tree's age
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Re: The popular notion that a tree's age can be determined by [#permalink]

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16 Dec 2011, 02:05
clearly E
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Re: CR 700 level question [#permalink]

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23 Dec 2011, 05:40
Another victim for the trap. Fell for C.

Agree that E is the better choice and should be the correct answer. Nice question ksp.
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Re: The popular notion that a tree's age can be determined by [#permalink]

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26 Dec 2011, 11:51
E

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Re: The popular notion that a tree's age can be determined by [#permalink]

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09 Jan 2012, 10:11
+ 1 E
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Re: The popular notion that a tree's age can be determined by [#permalink]

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10 Jan 2012, 01:56
+1 for E

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Re: The popular notion that a tree's age can be determined by [#permalink]

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23 Mar 2012, 03:36
pual wrote:
I will choose "A"

Going with PoE

Round 1
A - This can be right
B - This is being clearly stated in the argument and is therefore not an assumption
C - This can be right
D - This is not at al relevant to the premise or the conclusion
E - This has also been stated in the argument and should therefore not be an assumption

Round 2
We are left with A and C.
"A" - "A" is more appropriate because it affects the conclusion directly, if this is the assumption only then conclusion can be true.
"C" - for how long the temprature should stay at 95 for the ring to shed is no where being mentioned either in the premise or in conclusion..it therefore seems un-related.

Well,

I think assumption is always not that easy, because, unlike strengthening questions, assumptions seldom uses outside info.

Also, negation is not a fool-proof process, because, even negating choices that are outside scope can be misleading.
For ex, we are concerned only about the heating aspect here, and its effect on the no. of rings.
However, negating A will also imply that, number of rings is not predictable(since precipitation may increase no. of rings when you negate A).
However, melting is beyond scope here and assumptions clarify the gap between prem. and concl. only.
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Re: The popular notion that a tree's age can be determined by [#permalink]

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23 Mar 2012, 05:51
straight E, rest are meaningless options
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Re: The popular notion that a tree's age can be determined by [#permalink]

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26 Mar 2012, 06:30
IMO E...

if we are ble to predict the # of rings lost due to high temparature, then we will able to predict the age of the tree.

negating E clearly makes the conclusion invalid.. hence E
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Re: The popular notion that a tree's age can be determined by [#permalink]

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26 Mar 2012, 18:17
+1 E

If it is possible to determine how many rings are lost after an increase in the temperature, it would be possible to determine the age of the tree.
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Re: The popular notion that a tree's age can be determined by [#permalink]

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01 Apr 2012, 10:42
IMO E........

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Re: The popular notion that a tree's age can be determined by   [#permalink] 01 Apr 2012, 10:42

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