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#Top150 CR: In a survey of all 14,000 undergraduates in a University

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#Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Dec 2015, 08:23
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A
B
C
D
E

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  95% (hard)

Question Stats:

32% (01:54) correct 68% (01:51) wrong based on 258 sessions

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In a survey of all 14,000 undergraduates in a University, over the last four years, an average of 61 percent admitted to cheating on assignments and examinations. The figure declined somewhat from 65 percent earlier in the decade, but the number students cheating in examinations as reported by the examination office has increased over the same period.

Which of the following best explains the discrepancy outlined above?

A. The examinations office has become more effective in identifying instances of cheating.

B. Those students who used to earlier cheat in assignments have now started cheating in examinations alone.

C. The number of students who cheat has increased but the percentage has decreased over the past 4 years.

D. Students have not provided correct and representative answers in the survey and thus impacted the validity of the results.

E. The sample of 14,000 students is not large enough to draw such inferences about the whole University.

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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Dec 2015, 09:21
C because percentage and number of students are different
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Dec 2015, 09:25
IMO C Other options question validity of survey
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Dec 2015, 09:47
IMO A is the correct answer.
B is close but not foolproof, I think.
C is a trap answer.
D and E are irrelevant.
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Dec 2015, 09:49
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C cannot be the answer as it is restating the premises.

A it is.

The percentage of students ADMITTING has decreased but the number as REPORTED by college has increased. The correct answer will bring out this difference between students admitting and college reporting. A does it well by stating that college has become more effective in identifying instances of cheating hence no. of reporting will definitely go up despite percentage of students declining.
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 15 Jan 2016, 02:46
The argument states that 'over the last four years, an average of 61% admitted...' and that this figure 'declined somewhat from 65% earlier in the decade'

Answer choice C, states that 'the percentage has decreased over the past 4 years' which is somethig we cannot assure. Maybe, for the past four years the respective percentages were 60%-61%-61%-62%. In this case, the percentage has increased, not decreased, and is still under 65%.
ie:
Year %
2005 65%
2006 65%
2007 65%
2008 65%
2009 65%
2010 65%
2011 60%
2012 61%
2013 61%
2014 62%

This is why the correct answer is A rather than C
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 15 Jan 2016, 03:15
fecob wrote:
The argument states that 'over the last four years, an average of 61% admitted...' and that this figure 'declined somewhat from 65% earlier in the decade'

Answer choice C, states that 'the percentage has decreased over the past 4 years' which is somethig we cannot assure. Maybe, for the past four years the respective percentages were 60%-61%-61%-62%. In this case, the percentage has increased, not decreased, and is still under 65%.
ie:
Year %
2005 65%
2006 65%
2007 65%
2008 65%
2009 65%
2010 65%
2011 60%
2012 61%
2013 61%
2014 62%

This is why the correct answer is A rather than C


hi,
the main thing from the C is that..
"C. The number of students who cheat has increased but the percentage has decreased over the past 4 years"..

How is above possible.. It is possible if the number of students taking the exam has increased. this will lead to a lower percentage giving us a larger number..

say 100 students gave exam in previous decade... 65% means 65 were caught/admitted to cheating..
this year 200 students gave exam.. 61%, which is 122, were caught/admitted to cheating...
so number has increased from 65 to 122 but the % has decreased to 61% from 65%..

But what are we talking of in our conclusion.. we are talking of those caught and reported by examination office, which gets strengthened by A
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Jan 2018, 01:52
the survey here is just a distracting information that plays as an effective trap.
The question actually asks about why more students are caught cheating. Here, the scope, or the discrepancy now has shifted from survey to "the number students cheating in examinations as reported." -> A is the answer.
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Re: #Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 04 Jan 2018, 03:09
nikunjbali21 wrote:
C

Sent from my Redmi Note 4 using GMAT Club Forum mobile app


"over the past 4 years" is the reason why C is wrong.
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#Top150 CR: In a survey of all 14,000 undergraduates in a University  [#permalink]

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New post 15 Apr 2018, 04:17
souvik101990 wrote:
In a survey of all 14,000 undergraduates in a University, over the last four years, an average of 61 percent admitted to cheating on assignments and examinations. The figure declined somewhat from 65 percent earlier in the decade, but the number students cheating in examinations as reported by the examination office has increased over the same period.

Which of the following best explains the discrepancy outlined above?


A. The examinations office has become more effective in identifying instances of cheating. This explains why the examinations office claims that the number of students cheating in examinations has increased.

B. Those students who used to earlier cheat in assignments have now started cheating in examinations alone. This would have made the percentage of cheaters on assignment fall significantly. That is not the case here.

C. The number of students who cheat has increased but the percentage has decreased over the past 4 years.4 year data is not sufficient to make this claim. Hence IRRELEVANT.

D. Students have not provided correct and representative answers in the survey and thus impacted the validity of the results.There isn't sufficient grounds to derive this conclusion

E. The sample of 14,000 students is not large enough to draw such inferences about the whole University.The survey includes all students as enumerated by the phrase "In a survey of all 14,000 undergraduates in a University".
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