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The average age of chief executive officers (CEO s) in a

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The average age of chief executive officers (CEO s) in a [#permalink] New post 09 Oct 2006, 09:38
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A
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C
D
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The average age of chief executive officers (CEO’s) in a large sample of companies is 57. The average age of CEO’s in those same companies 20 years ago was approximately eight years younger. On the basis of those data, it can be concluded that CEO’s in general tend to be older now.
Which of the following casts the most doubt on the conclusion drawn above?
(A) The dates when the CEO’s assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that CEO’s remain in office.
(C) The information is based only on companies that have been operating for at least 20 years.
(D) Only approximate information is given concerning the average age of the CEO’s 20 years ago.
(E) Information concerning the exact number of companies in the sample has not been given.
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 [#permalink] New post 09 Oct 2006, 17:16
C for me

Sample is representative of companies that have been in existence for 20 yrs but generalisation is for all companies. C points this out.
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 [#permalink] New post 09 Oct 2006, 18:56
yep...C for me too...the argument takes into consideration only companies that were existing for 20 years...we can't generalize that to all the companies.
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 [#permalink] New post 10 Oct 2006, 03:54
C 2
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 [#permalink] New post 10 Oct 2006, 04:11
B

If some of the CEOs from 20 years ago remain in office even today, that would skew the average age of CEOs today.
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 [#permalink] New post 10 Oct 2006, 07:15
Looks like C.
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 [#permalink] New post 10 Oct 2006, 07:25
anandsebastin wrote:
B

If some of the CEOs from 20 years ago remain in office even today, that would skew the average age of CEOs today.


Agree with your reasoning and bet B on this one :)
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 [#permalink] New post 10 Oct 2006, 08:04
between A and B
A if we knew when the CEOs assumed their current positions, i.e 20 years ago, the average would 69 and not 57. So younger CEOs have been added to bring the average down. Or those CEOs did not remain longer in the office (option B)

I pick B
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 [#permalink] New post 10 Oct 2006, 11:16
anandsebastin wrote:
B

If some of the CEOs from 20 years ago remain in office even today, that would skew the average age of CEOs today.


So doesn't this go back to the question of "sample". If the survey had included companies that were more recent (<20 yrs) there is a possibility that the average age of CEO's might be a lot younger/older. Only because the sample includes companies that have been in existence atleast 20 yrs, there is a possibility that the CEO's have stayed in power for 20 yrs and this might skew the average age.

So according to me option B is a result of option C being true. Hence C casts the most doubt.

Hope this makes some sense :roll:
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 [#permalink] New post 10 Oct 2006, 11:35
anandsebastin wrote:
B

If some of the CEOs from 20 years ago remain in office even today, that would skew the average age of CEOs today.


I think its C.

Tenure of the CEO cannot be tied to average age and its irrelevent for this argument. C points out that a large pool of data has been ignored hence the results could be skewed.
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 [#permalink] New post 10 Oct 2006, 12:55
Has to be C.
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 [#permalink] New post 10 Oct 2006, 15:05
B for me too
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 [#permalink] New post 10 Oct 2006, 16:32
OA Is C
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Re: CR Question [#permalink] New post 10 Oct 2006, 18:43
c is right because the conclusion is generalized wheereas the evidence is specific.
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 [#permalink] New post 10 Oct 2006, 18:48
laxieqv wrote:
anandsebastin wrote:
B

If some of the CEOs from 20 years ago remain in office even today, that would skew the average age of CEOs today.


Agree with your reasoning and bet B on this one :)


The focus here is the average age of CEOs, not when they are becoming CEOs, or at what age they are retiring. If the focus is latter, then B can be the answer. No?
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  [#permalink] 10 Oct 2006, 18:48
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