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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]

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24 Jul 2008, 09:01
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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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24 Jul 2008, 09:23
C?

I believe there is a sampling error. The conclusion is made on the based on a limited sample (57 companies)
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24 Jul 2008, 10:11
D

Average age vs. Average approximately
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24 Jul 2008, 11:55
I dont seem to understand the linkage between the averages that you've indicated to support D.

Could you please outline the logic. Thanks!
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24 Jul 2008, 12:01
I am stuck between A and B and IMO its B.

No information is given concerning the average number of years that CEO’s remain in office.

If not information is given about the average number of years that CEO’s remain in office it is possible that most of the CEOs are sitting in office for quite some years and hence because of that the average has increased.

Though A also looks equally good.
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24 Jul 2008, 13:56
I pick A.
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24 Jul 2008, 15:42
C: small sample bias
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24 Jul 2008, 17:06
grepro wrote:
I am stuck between A and B and IMO its B.

No information is given concerning the average number of years that CEO’s remain in office.

If not information is given about the average number of years that CEO’s remain in office it is possible that most of the CEOs are sitting in office for quite some years and hence because of that the average has increased.

Though A also looks equally good.

even i selected B but its not the OA
OA is C
y cant the term of CEO count in this scenario?
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24 Jul 2008, 17:09
On rethinking i feel that A and B says more or less the same thing and since both cannot be correct C is the best alternative.
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24 Jul 2008, 17:24
grepro wrote:
On rethinking i feel that A and B says more or less the same thing and since both cannot be correct C is the best alternative.

I dont consider this a valid logic to decide
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25 Jul 2008, 11:11
spriya wrote:
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.

Argument is of Representative type.
sample 1: The average age of CEO’s in those same companies 20 years ago was approximately eight years younger.
>>>Here is data sample is about CEOs working 20 years ago

sample 2:On the basis of those data, it can be concluded that CEO’s in general tend to be older now
>>>Conclusion is applied to all CEOs .

C
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25 Jul 2008, 18:05
goalsnr wrote:
spriya wrote:
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.

Argument is of Representative type.
sample 1: The average age of CEO’s in those same companies 20 years ago was approximately eight years younger.
>>>Here is data sample is about CEOs working 20 years ago

sample 2:On the basis of those data, it can be concluded that CEO’s in general tend to be older now
>>>Conclusion is applied to all CEOs .

C

Ok here is the case of a limited data taken to make a generic decision
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25 Jul 2008, 18:09
spriya wrote:
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.

IMO B

EDIT: I see ... I should have stayed in scope. C make sense
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25 Jul 2008, 20:49
True even i got confused b/w A and B but then C makes more sense due to the statistical misrepresentation in the question. Clearly a case of a special set being generalized.
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26 Jul 2008, 00:25
grepro wrote:
On rethinking i feel that A and B says more or less the same thing and since both cannot be correct C is the best alternative.

Additionally B is a better option than A since it gives the average
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Re: The average age of chief executive officers (CEO s) in a [#permalink]

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22 Mar 2013, 13:58
OA is C
Why not B??
C is definitely right but B is also correct.. wht if the avg tenure period is 25 years (assuming) so the average taken 20 years back is bound to be less than what it is now.. is it not??
Re: The average age of chief executive officers (CEO s) in a   [#permalink] 22 Mar 2013, 13:58
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