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A survey of a group of people between the ages of 75 and 80

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A survey of a group of people between the ages of 75 and 80 [#permalink] New post 21 May 2009, 18:51
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A
B
C
D
E

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50% (01:22) correct 50% (01:32) wrong based on 8 sessions
A survey of a group of people between the ages of 75 and 80 found that those who regularly played the card game bridge tended to have better short-term memory than those who did not play bridge. It was originally concluded from this that playing bridge can help older people to retain and develop their memory. However, it may well be that bridge is simply a more enjoyable game for people who already have good short-term memory and who are thus more inclined to play.
In countering the original conclusion the reasoning above uses which one of the following techniques?
(A) challenging the representativeness of the sample surveyed
(B) conceding the suggested relationship between playing bridge and short-term memory, but questioning whether any conclusion about appropriate therapy can be drawn
(C) arguing that the original conclusion relied on an inaccurate understanding of the motives that the people surveyed have for playing bridge
(D) providing an alternative hypothesis to explain the data on which the original conclusion was based
(E) describing a flaw in the reasoning on which the original conclusion was based
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Re: Survey [#permalink] New post 21 May 2009, 19:13
IMO E

A survey of a group of people between the ages of 75 and 80 found that those who regularly played the card game bridge tended to have better short-term memory than those who did not play bridge. It was originally concluded from this that playing bridge can help older people to retain and develop their memory. However, it may well be that bridge is simply a more enjoyable game for people who already have good short-term memory and who are thus more inclined to play.
In countering the original conclusion the reasoning above uses which one of the following techniques?
(A) challenging the representativeness of the sample surveyed --> no
(B) conceding the suggested relationship between playing bridge and short-term memory, but questioning whether any conclusion about appropriate therapy can be drawn -->no therapy conclusion is drawn then
(C) arguing that the original conclusion relied on an inaccurate understanding of the motives that the people surveyed have for playing bridge -->there are no original motives described here
(D) providing an alternative hypothesis to explain the data on which the original conclusion was based -->it's not about explain data, because data is flawless, but always true
(E) describing a flaw in the reasoning on which the original conclusion was based -->flaw: cause --> effect can be reversed to effect --> cause
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Re: Survey [#permalink] New post 22 May 2009, 22:12
sondenso wrote:
A survey of a group of people between the ages of 75 and 80 found that those who regularly played the card game bridge tended to have better short-term memory than those who did not play bridge. It was originally concluded from this that playing bridge can help older people to retain and develop their memory. However, it may well be that bridge is simply a more enjoyable game for people who already have good short-term memory and who are thus more inclined to play.
In countering the original conclusion the reasoning above uses which one of the following techniques?
(A) challenging the representativeness of the sample surveyed
(B) conceding the suggested relationship between playing bridge and short-term memory, but questioning whether any conclusion about appropriate therapy can be drawn
(C) arguing that the original conclusion relied on an inaccurate understanding of the motives that the people surveyed have for playing bridge
(D) providing an alternative hypothesis to explain the data on which the original conclusion was based
(E) describing a flaw in the reasoning on which the original conclusion was based


(A) The survey sample was not challenged in anyway
(B) There was no mention of any therapy being involved
(C) Motives were not part of either argument
(E) This is a little too general compared to choice (D), although it is somewhat of an close description.

(D) This is the most appropriate description of the argument; it reverses the causal link from "bridge --> better short term memory" to "good short term mem --> bridge".
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Re: Survey [#permalink] New post 23 May 2009, 02:31
GMATaddict wrote:
sondenso wrote:
A survey of a group of people between the ages of 75 and 80 found that those who regularly played the card game bridge tended to have better short-term memory than those who did not play bridge. It was originally concluded from this that playing bridge can help older people to retain and develop their memory. However, it may well be that bridge is simply a more enjoyable game for people who already have good short-term memory and who are thus more inclined to play.
In countering the original conclusion the reasoning above uses which one of the following techniques?
(A) challenging the representativeness of the sample surveyed
(B) conceding the suggested relationship between playing bridge and short-term memory, but questioning whether any conclusion about appropriate therapy can be drawn
(C) arguing that the original conclusion relied on an inaccurate understanding of the motives that the people surveyed have for playing bridge
(D) providing an alternative hypothesis to explain the data on which the original conclusion was based
(E) describing a flaw in the reasoning on which the original conclusion was based


(A) The survey sample was not challenged in anyway
(B) There was no mention of any therapy being involved
(C) Motives were not part of either argument
(E) This is a little too general compared to choice (D), although it is somewhat of an close description.

(D) This is the most appropriate description of the argument; it reverses the causal link from "bridge --> better short term memory" to "good short term mem --> bridge".


Guys, what is difference btw D and E?
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Re: Survey [#permalink] New post 18 Jan 2010, 23:12
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The answer D says that the same data is used, but u are basically changing cause and effect relationship, which might mean as changing hypothesis.
Answer E is too general IMO, no flaw in reasoning is pointed out.
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Re: A survey of a group of people between the ages of 75 and 80 [#permalink] New post 17 Nov 2011, 05:31
The difference between D and E is in the way these two choices describe the method the main conclusion of the argument used to counter initial conclusion given by the author of the argument.


Choice E says that the main conclusion points to the flaw in the reasoning of the initial conclusion. Yet, from reading the passage the second time you can understand that Initial conclusions desists that because A happens ---> B happens. But, the main conclusion clearly states that because B happens ----> A happens. Thus, referring to cause and effect relationship. By the way, this type of questions are very common in GMAT CR test.


Hope it helps,
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Re: A survey of a group of people between the ages of 75 and 80 [#permalink] New post 17 Nov 2011, 13:35
I choose D...
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Re: A survey of a group of people between the ages of 75 and 80 [#permalink] New post 18 Nov 2011, 01:52
OA is D
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Re: A survey of a group of people between the ages of 75 and 80 [#permalink] New post 18 Nov 2011, 04:54
I will go with D

what is the correct answer?
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Re: A survey of a group of people between the ages of 75 and 80   [#permalink] 18 Nov 2011, 04:54
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A survey of a group of people between the ages of 75 and 80

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