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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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New post 24 Jul 2008, 10:01
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A
B
C
D
E

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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.
[Reveal] Spoiler: OA

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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 10:23
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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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 11:11
D

Average age vs. Average approximately

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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 12:55
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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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 13:01
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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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 14:56
I pick A.

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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 16:42
C: small sample bias

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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 18:06
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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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 18:09
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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Re: CR-ceo [#permalink]

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New post 24 Jul 2008, 18:24
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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Re: CR-ceo [#permalink]

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New post 25 Jul 2008, 12:11
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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Re: CR-ceo [#permalink]

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New post 25 Jul 2008, 19:05
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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Re: CR-ceo [#permalink]

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New post 25 Jul 2008, 19:09
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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Re: CR-ceo [#permalink]

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New post 25 Jul 2008, 21:49
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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Re: CR-ceo [#permalink]

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New post 26 Jul 2008, 01:25
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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The average age of chief executive officers in a large [#permalink]

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The average age of chief executive officers 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 avg no 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 avg age of the CEO's 20 years ago.
(E) Information concerning the exact number of companies in the sample has not been given.

Needed your views.Came down to two but then not confident.

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Re: Cr [#permalink]

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New post 19 Apr 2009, 23:32
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a)The dates when the CEO's assumed their current positions have not been specified.

IMO A, this undermines the conslusion

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Re: Cr [#permalink]

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New post 20 Apr 2009, 20:20
I came down to C and E.Went for C.But not sure.Any comments friends?

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Re: Cr [#permalink]

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New post 20 Apr 2009, 20:54
I feel C.

Since data collected is for the companies that exist for at least 20 yrs. So, it might be possible that few of these companies CEOs might have continued. We need to include more data to get idea about companies that are new to get idea about new trend.

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Re: Cr [#permalink]

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New post 21 Apr 2009, 00:32
C. Conclusion is generalization based only on data from companies that have been in the sample.

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Re: Cr   [#permalink] 21 Apr 2009, 00:32

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