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The average age of chief executive officers (CEO s) in a [#permalink]
09 Oct 2006, 10:38
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The average age of chief executive officers (CEOâ€™s) in a large sample of companies is 57. The average age of CEOâ€™s in those same companies 20 years ago was approximately eight years younger. On the basis of those data, it can be concluded that CEOâ€™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 CEOâ€™s assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that CEOâ€™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 CEOâ€™s 20 years ago.
(E) Information concerning the exact number of companies in the sample has not been given.
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)
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 _________________
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