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A survey of alumni of the class of 1960 at Aurora University

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A survey of alumni of the class of 1960 at Aurora University [#permalink] New post 16 Dec 2010, 07:20
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A
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67% (01:45) correct 33% (01:42) wrong based on 25 sessions
A survey of alumni of the class of 1960 at Aurora University yielded puzzling results. When asked to indicate their academic rank, half of the respondents reported that they were in the top quarter of the graduating class in 1960.

Which one of the following most helps account for the apparent contradiction above?
(A) A disproportionately large number of high-ranking alumni responded to the survey.
(B) Few, if any, respondents were mistaken about their class rank.
(C) Not all the alumni who were actually in the top quarter responded to the survey.
(D) Almost all of the alumni who graduated in 1960 responded to the survey.
(E) Academic rank at Aurora University was based on a number of considerations in addition to average grades.

Support your answers with explanations. OA to follow after the discussions..
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Re: Aurora University Alumni [#permalink] New post 16 Dec 2010, 08:42
abhi758 wrote:
A survey of alumni of the class of 1960 at Aurora University yielded puzzling results. When asked to indicate their academic rank, half of the respondents reported that they were in the top quarter of the graduating class in 1960.

Which one of the following most helps account for the apparent contradiction above?
(A) A disproportionately large number of high-ranking alumni responded to the survey.
(B) Few, if any, respondents were mistaken about their class rank.
(C) Not all the alumni who were actually in the top quarter responded to the survey.
(D) Almost all of the alumni who graduated in 1960 responded to the survey.
(E) Academic rank at Aurora University was based on a number of considerations in addition to average grades.

Support your answers with explanations. OA to follow after the discussions..


I say A

Because if a higher number of high ranking alumni responded than lower ranked alumni, the proportion of respondants who were a higher rank (top 25 percent) would be greater.
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Re: Aurora University Alumni [#permalink] New post 16 Dec 2010, 10:37
A.

Suppose, total number of alumni of class 1960 - 100
Total number of alumni who responded to survey - 50
Every body in top quarter (1/4) of class responded - 25 (which is half of total number of respondents)

Hence, it resolves the paradox.
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Re: Aurora University Alumni [#permalink] New post 16 Dec 2010, 10:59
Good responses! Well-explained Anshu..

OA
[Reveal] Spoiler:
A
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Re: Aurora University Alumni [#permalink] New post 06 May 2011, 02:53
A in 0:48 min .
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Re: A survey of alumni of the class of 1960 at Aurora University [#permalink] New post 18 Apr 2013, 01:09
abhi758 wrote:
A survey of alumni of the class of 1960 at Aurora University yielded puzzling results. When asked to indicate their academic rank, half of the respondents reported that they were in the top quarter of the graduating class in 1960.

Which one of the following most helps account for the apparent contradiction above?
(A) A disproportionately large number of high-ranking alumni responded to the survey.
(B) Few, if any, respondents were mistaken about their class rank.
(C) Not all the alumni who were actually in the top quarter responded to the survey.
(D) Almost all of the alumni who graduated in 1960 responded to the survey.
(E) Academic rank at Aurora University was based on a number of considerations in addition to average grades.

Support your answers with explanations. OA to follow after the discussions..


Clearly A:

For example: class 1960 has 100 students ==> 25% = 25 people.
But in the survey, there was only 50 students participated and 1/2 of them which is 25 people was in the top quarter.
==> 1/2 of respondents accounts for top 25% of the graduating class in 1960.
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Re: A survey of alumni of the class of 1960 at Aurora University [#permalink] New post 18 Apr 2013, 11:32
Good question...Sure A...
If the wtd avg of the students in top qrtr was more than surely this is a flaw or contradiction .....

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Re: A survey of alumni of the class of 1960 at Aurora University   [#permalink] 18 Apr 2013, 11:32
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A survey of alumni of the class of 1960 at Aurora University

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