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

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[quote="suyashjhawar"]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?

It helps to give the reasons why you eliminated the wrong answers....


(A) The dates when the CEO's assumed their current positions have not been specified.

The data represents the average age of CEO of the companies in the sample. It doesn't matter when they took their positions, just that they are the current CEOs.

(B) No information is given concerning the avg no of years that CEO's remain in office.

Again, the data is comparing ages of CEOs today (current CEO) vs. the age of the CEO 20 years ago, whoever it was. It doesn't matter how long they've been in office.

(C) The information is based only on companies that have been operating for at least 20 years.

The data sample is limited to only 20+ year old companies... This should give you a clue that a limited sample cannot be the basis for a wide generalization such as the conclusion of the stimulus. This is the answer.

(D) Only approximate information is given concerning the avg age of the CEO's 20 years ago.

The approximations of the data doesn't really change the data, one set is higher and one is lower.

(E) Information concerning the exact number of companies in the sample has not been given.

if the data sample was from all of the fortune 1000 companies vs. only 10 companies, the data would reflect a more accurate representation. This point could weaken the conclusion slightly. However, C is a stronger argument.
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Re: Cr [#permalink]

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New post 20 Mar 2010, 06:35
The scope of the data is limited to that of companies operating 20 years ago. The result is
a generalization that does not necessarily represent the true picture of the other companies.
Ages of CEO's in X, Y, Z companies 20yrs ago; Ages of CEO's in same company now.

Sure misrepresentation.

The correct response should be C
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Re: Cr [#permalink]

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New post 20 Mar 2010, 10:30
C is the answer. The companies taken into account are those only which are there for past 20 years. That actually negates the conclusion drawn from the data.
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Re: Cr [#permalink]

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New post 20 Mar 2010, 15:48
C

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Re: Cr [#permalink]

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New post 07 Sep 2010, 00:36
My answer is C.

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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 08 Oct 2010, 19:32
the word 'general' should trigger that data for 57 companies cannot be generalised and hence option C is correct.
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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 08 Oct 2010, 23:51
its c

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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 09 Oct 2010, 01:14
good question, C makes sense

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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 09 Oct 2010, 03:23
Got it right but i had solved it earlier too.

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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 09 Oct 2010, 10:33
I was between B and C and choose the wrong one.
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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 09 Oct 2010, 11:42
I chose C.

shalva wrote:
You have to show that in fact CEOs aren't getting older.

Be careful, you missed a few words. They actually get older in these surveyed companies, but the conclusion talks about "in general".

The trick as you stated is to attack the evidence, and show that the data is flawed.

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Re: The average age of chief executive officers (CEO’s) [#permalink]

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New post 09 Oct 2010, 13:30
Fell for B :(

Should be careful when conclusions are drawn on the basis of some data... :(

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Re: Cr [#permalink]

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New post 15 Mar 2011, 07:42
+1 for C

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New post 15 Mar 2011, 19:30
I am struggling between C and E. i find a post saying that C is a stronger argument than E. I want to know why C is stronger? thanks for replying.

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Re: Cr [#permalink]

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New post 15 Mar 2011, 23:19
lidong123 wrote:
I am struggling between C and E. i find a post saying that C is a stronger argument than E. I want to know why C is stronger? thanks for replying.



I think, answer E is wrong because it is given that to calculate the average at both the time i.e now and 20 years before, we have taken same number of companies. So, till the time we are comparing same number of companies, we can compare the two averages irrespective of total number of companies used to calculate the average. But in option C it is case of generalization. Author has concluded “CEO's in general tend to be older now” based on data from few companies that are operating from past 20 years. Author conclusion will be correct if he concludes, “CEO's in [strike]general[/strike] these companies tend to be older now.”

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Re: Cr [#permalink]

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New post 15 Mar 2011, 23:22
+1 for you firasath. Nice explantion, but I am not convinced with your explanation of option E. I have tried explaining that, please give your comments.

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Re: Cr [#permalink]

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New post 02 Jul 2011, 19:42
C for me.

Since the survey was conducted on the same set of companies it can't be representative of the set of all companies.

Crick

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New post 02 Jul 2011, 20:22
Great question.

Paraphrasing the question:
e: avg age of ceo of a sample of companies = 57
avg. age of ceo of the same sample of companies 20 years ago ~ 49
c: therefore, ceo's tend to be older now

assumption: only companies that are 20 or more years old are in the group

since the assumption is only a subset of a larger set of companies, it cannot be used to generalize a statement. Hence I picked C.

(C) The information is based only on companies that have been operating for at least 20 years.

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Re: The average age of chief executive officers (CEO s) in a [#permalink]

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New post 03 Oct 2012, 21:45
Why can't the answer be a? Suppose a CEO was assigned to current designation several years ago, then one cannot say that he took this position when he was old.
IMO both a and c are top contenders.
Please correct me if I am wrong
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Re: The average age of chief executive officers (CEO s) in a [#permalink]

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New post 03 Oct 2012, 22:15
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siddharthasingh wrote:
Why can't the answer be a? Suppose a CEO was assigned to current designation several years ago, then one cannot say that he took this position when he was old.
IMO both a and c are top contenders.
Please correct me if I am wrong


Even if there are many such cases (the CEO has been the same for the last 20 yrs), it still doesn't weaken our conclusion. Our conclusion is that CEO’s in general tend to be older now. It doesn't matter why the CEOs are older now. The conclusion says that they are older and that's true even if the CEOs have grown old while on the CEO chair.

On the other hand, option (C) says that the conclusion is being drawn on a sample of a particular type of companies. This means you cannot generalize whatever you observe in the sample. Hence it weakens our conclusion that CEO’s in general tend to be older now.
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Re: The average age of chief executive officers (CEO s) in a   [#permalink] 03 Oct 2012, 22:15

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