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

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Director
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The average age of chief executive officers (CEO s) in a [#permalink] New post 14 Sep 2005, 18:34
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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.

Pls explain your answer. Thanks!
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 [#permalink] New post 14 Sep 2005, 21:12
I would go for "B".

Since average number of years CEO remians in the office will affect the overall average age of CEO's.
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 [#permalink] New post 14 Sep 2005, 22:41
I would also go with B because since 20 years ago, the CEO is 8 years younger then the average age, then we must know how long is each CEO in office. That way, we would be able to estimate approximately why their average age 20 years later would be 57.
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 [#permalink] New post 15 Sep 2005, 00:32
I believe the correct answer is (C)

(I remember seeing this problem somewhere else)


The original sample group was CEO's in 57 companies, but the conclusion is based only on companies which had been run for at least 20 years.

Therefore, unless we are told that all the 57 companies had been run for at least 20 years, we can never say that "The average age of CEO's in THOSE SAME COMPANIES 20 years ago was approximately eight years younger".

Last edited by gamjatang on 15 Sep 2005, 00:54, edited 2 times in total.
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 [#permalink] New post 15 Sep 2005, 00:33
-duplication-
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 [#permalink] New post 15 Sep 2005, 03:11
i just cant stress my muscles for this kind of obscure questions with so many parameters.
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 [#permalink] New post 15 Sep 2005, 04:48
I would pick A
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 [#permalink] New post 15 Sep 2005, 05:05
shud be C.
The survey makes a generalized statement based on a survey that is limited to companies that are 20+ years old.

OA/OE Plz.

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 [#permalink] New post 15 Sep 2005, 06:00
OA is C guys!
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  [#permalink] 15 Sep 2005, 06:00
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