The average age of chief executive officers (CEOs) in a : GMAT Critical Reasoning (CR)
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The average age of chief executive officers (CEOs) in a

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The average age of chief executive officers (CEOs) in a [#permalink]

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04 Jun 2008, 19:28
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The average age of chief executive officers (CEOs) in a large sample of companies is 57. The average age of CEOs in those same companies 20 years ago was approximately eight years younger. On the basis of those data, it can be concluded that CEOs 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 CEOs assumed their current positions have not been specified.
B. No information is given concerning the average number of years that CEOs 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 CEOs 20 years ago.
E. Information concerning the exact number of companies in the sample has not been given.
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 19:44
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sebycb976 wrote:
The average age of chief executive officers (CEOs) in a large sample of companies is 57. The average age of CEOs in those same companies 20 years ago was approximately eight years younger. On the basis of those data, it can be concluded that CEOs 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 CEOs assumed their current positions have not been specified.
B. No information is given concerning the average number of years that CEOs 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 CEOs 20 years ago.
E. Information concerning the exact number of companies in the sample has not been given.

C is the answer to me. By giving the example of those companies operated for 20 years, you can not draw a conclusion for the trend in general.

A, B, D, and E are all irrelevant.
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 19:53
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sebycb976 wrote:
The average age of chief executive officers (CEOs) in a large sample of companies is 57. The average age of CEOs in those same companies 20 years ago was approximately eight years younger. On the basis of those data, it can be concluded that CEOs 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 CEOs assumed their current positions have not been specified.
B. No information is given concerning the average number of years that CEOs 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 CEOs 20 years ago.
E. Information concerning the exact number of companies in the sample has not been given.

A: Dates are not relevant
B: the number of years that CEO remain is not relevant
D: Fact, passage also mentions nowadays data
E: the number of companies is not relevant.

C is best!

Last edited by lexis on 04 Jun 2008, 19:54, edited 1 time in total.
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 19:53
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E should weaken the conclusion
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 20:01
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I feel it is C..
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 20:12
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C for me.

I think this weakens the argument because, although the trend for companies with 20+ years or operation have older CEOs, these companies could only represent a small fraction of all companies and therefore is hard to say that the general trend (for ALL companies) is for older CEOs.

A. I don't see this adding anything to the argument. If the average had a gap of 20+ years then maybe. -- someone else could maybe offer a better explanation.
B. Again, like A, doesn't really impact the argument
D. Age is the key point here and it's already been given for CEOs 20 years ago.
E. Already mentioned that it's a large sample. Also, it's limited to companies with 20+ years of operations.
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 20:21
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C too.

Can someone explain
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Re: CR - CEOs Age [#permalink]

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04 Jun 2008, 20:26
The OA is C.
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Re: CR - CEOs Age [#permalink]

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05 Jun 2008, 06:27
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sebycb976 wrote:
The average age of chief executive officers (CEOs) in a large sample of companies is 57. The average age of CEOs in those same companies 20 years ago was approximately eight years younger. On the basis of those data, it can be concluded that CEOs 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 CEOs assumed their current positions have not been specified.
B. No information is given concerning the average number of years that CEOs 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 CEOs 20 years ago.
E. Information concerning the exact number of companies in the sample has not been given.

C is right because the question has what is called as fallacy of insufficient sample space.based on 20 year's data of a certain number of companies, a generalized conclusion can't be reached.
Re: CR - CEOs Age   [#permalink] 05 Jun 2008, 06:27
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