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The average age of university presidents in a large sample

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The average age of university presidents in a large sample  [#permalink]

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New post 28 Oct 2010, 01:55
4
9
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A
B
C
D
E

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  65% (hard)

Question Stats:

53% (01:34) correct 47% (01:50) wrong based on 401 sessions

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The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, 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 university presidents assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that university presidents remain in office.
(C) The information is based only on universities that have been operating for at least 25 years.
(D) Information concerning the exact number of universities in the sample has not been given.
(E) None of the answers provided cast doubt on the conclusion drawn above.
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Re: average age of university presidents  [#permalink]

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New post 29 Oct 2010, 10:51
+1 C 8-)

A and B are tempting. However, based on that the sample is not representative, you cannot conclude anything about universities in general.

That's why C is correct.
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New post 29 Oct 2010, 22:12
+1 c .. we are moving from specific in formation ( universities older than 25 years ) to general conclsion about "all " the universities ......
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New post 30 Oct 2010, 04:55
I took a different spin on this, I chose C, however purely because 25 years ago there was no internet so conclusion is wrong. Can't compare the data points 25 yrs ago to now.
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Re: The average age of university presidents in a large sample  [#permalink]

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New post 03 Jan 2014, 08:19
feruz77 wrote:
The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, 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 university presidents assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that university presidents remain in office.
(C) The information is based only on universities that have been operating for at least 25 years.
(D) Information concerning the exact number of universities in the sample has not been given.
(E) None of the answers provided cast doubt on the conclusion drawn above.


Do we get option e) type of option as well. None of the above? I have never seen this kind of option in OG or gmatprep.
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Re: The average age of university presidents in a large sample  [#permalink]

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New post 03 Jan 2014, 11:32
The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, in general tend to be older now.

can't understand why "c" is the correct answer......for this weaken question.... "C" could have been an answer for a flaw question where it could be said that since the CONCLUSION pertains to all universities.... the premise should also have represented all, rather than only those universities which are at least 25 years old....inthat case "C" would have been the right answer.....

(C) The information is based only on universities that have been operating for at least 25 years.

A weaken answer could have been...." universities that have been operating for at least 25 years comprise only 10 % of all universities..".
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Re: The average age of university presidents in a large sample  [#permalink]

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New post 01 Feb 2014, 10:08
feruz77 wrote:
The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, 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 university presidents assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that university presidents remain in office.
(C) The information is based only on universities that have been operating for at least 25 years.
(D) Information concerning the exact number of universities in the sample has not been given.
(E) None of the answers provided cast doubt on the conclusion drawn above.


This question is indeed very similar to the one about the CEO's and answer is of course C because we can't generalize based on a sample of universities that have only been operating for the last 25 years

Hope its clear
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Re: The average age of university presidents in a large sample  [#permalink]

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New post 07 Mar 2015, 03:02
feruz77 wrote:
The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, 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 university presidents assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that university presidents remain in office.
(C) The information is based only on universities that have been operating for at least 25 years.
(D) Information concerning the exact number of universities in the sample has not been given.
(E) None of the answers provided cast doubt on the conclusion drawn above.



took sometime to read through all the options.
C is straight forward answer.
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Re: The average age of university presidents in a large sample  [#permalink]

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New post 04 Nov 2018, 11:42
feruz77 wrote:
The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, 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 university presidents assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that university presidents remain in office.
(C) The information is based only on universities that have been operating for at least 25 years.
(D) Information concerning the exact number of universities in the sample has not been given.
(E) None of the answers provided cast doubt on the conclusion drawn above.


--- in general tend to be older now---
We see this phrase ---> we have to talk about universities in general ---> C
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Re: The average age of university presidents in a large sample  [#permalink]

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New post 04 Jul 2019, 01:30
feruz77 wrote:
The average age of university presidents in a large sample of universities is 62. The average age of university presidents in those same universities 25 years ago was approximately eight years younger. On the basis of those data, it can be concluded that university presidents, including those at online universities, 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 university presidents assumed their current positions have not been specified.
(B) No information is given concerning the average number of years that university presidents remain in office.
(C) The information is based only on universities that have been operating for at least 25 years.
(D) Information concerning the exact number of universities in the sample has not been given.
(E) None of the answers provided cast doubt on the conclusion drawn above.


OFFICIAL EXPLANATION:



From a study of the average ages of university presidents in ‘a large sample of universities’ a general conclusion has been arrived at, which is then presumed to be applicable to all universities.

We have been asked to identify that choice which would cast the most doubt on this conclusion. Since the question asks for the answer that casts the most doubt, one of the answers must be chosen and answer (E) none of the above is incorrect.

We should therefore look for that statement which implies that the sample universities studied did not represent the majority of universities in some important respect, and that it is therefore unscientific to arrive at a general conclusion based on this unrepresentative sample. (A ‘large sample’ may still constitute a minority of the total number of companies.)

The phrase ‘in those same universities 20 years ago’ in the third line of the passage implies that the companies taken up for the sample study were limited to those which have been operating for more than 20 years. If a many of the existing universities (including online universities) are, in fact, less than 20 years old, the phenomenon prevailing in the older universities cannot be inferred as being applicable generally to all universities. It is quite likely that the average age of the university presidents of newer universities is much less than 57.

It is (C) which implies this, and is the answer.
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Re: The average age of university presidents in a large sample   [#permalink] 04 Jul 2019, 01:30
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