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Cheever College offers several online courses via remote

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Cheever College offers several online courses via remote [#permalink] New post 12 May 2011, 00:37
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67% (02:20) correct 33% (01:47) wrong based on 233 sessions
Cheever College offers several online courses via remote computer connection, in addition to traditional classroom-based courses. A study of student performance at Cheever found that, overall, the average student grade for online courses matched that for classroom-based courses. In this calculation of the average grade, course withdrawals were weighted as equivalent to a course failure, and the rate of withdrawal was much lower for students enrolled in classroom-based courses than for students enrolled in online courses.

If the statements above are true, which of the following must also be true of Cheever College?

(A) Among students who did not withdraw, students enrolled in online courses got higher grades, on average, than students enrolled in classroom-based courses.
(B) The number of students enrolled per course at the start of the school term is much higher, on average, for the online courses than for the classroom-based courses.
(C) There are no students who take both an online and a classroom-based course in the same school term.
(D) Among Cheever College students with the best grades, a significant majority take online, rather than classroom-based, courses.
(E) Courses offered online tend to deal with subject matter that is less challenging than that of classroom-based courses.

Official Guide 12 Question

GMAT Official Guide 12

Question: 31
Page: 38
Difficulty: 600

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Video Explanations:
[Reveal] Spoiler: OA

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Re: average student grade [#permalink] New post 12 May 2011, 02:44
GMATD11 wrote:
31) Cheever college offers several online courses via remote computer connection, in addition to traditional classroom-based courses. A study of student performance at Cheever found that, overall the average student grade for online courses matched that for classroom- based courses. In this calculation of the average grade, course withdrawals were weighted as equivalent to a course failure, and the rate of withdrawals was much lower for students enrolled in online courses.

If the statement above are true, which of the following must also be true of Cheever college?

Use fact test for must be true/conclusion deriving/inference kind of questions. The option should be traced back to a reference in the argument.

a) Among students who did not withdraw, students enrolled in online courses got higher grades, on average, than students enrolled in classroom based courses. -- discussed below.

b) The number of students enrolled per course at the start of the school term is much higher, on average, for the online courses than for the classroom-based courses -- Not discussed

c) There are no students who take both an online and a classroom-based courses in the same school term -- An assumption answer choice it is rather.

d) Among Cheever College students with best grades, a significant majority take online, rather than classroom-based, courses -- Discussed below.

e) Courses offered online tend to deal with subject matter that is less challenging than that of classroom-based courses. -- not discussed.

I marked A but wrong


people enrolled in online and traditional = Pon | Ptra Pon > Ptra
scores of online and traditional students = Son | Stra

Son/Pon = Stra/Ptra => Son > Stra meaning scores of online enrolled students should be more than traditional students.

hence D fits in perfectly meaning higher scores of online students.
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Re: average student grade [#permalink] New post 26 Jul 2011, 07:43
singalong wrote:
This is from OG12. OA is A.


OG question is not exactly same. OG question says "the rate of withdrawal was much lower for students enrolled in classroom-based courses than for students enrolled in online courses." Here it is exactly opposite.
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Re: Cheever College offers several online courses via remote [#permalink] New post 01 Dec 2011, 23:05
Why D is not a correct answer? I think avg is the same, and the withdraw rate of students in online >> (much higher) withdraw rate of students in classroom --> more students fail in online classes, but they are still counted when calculating avg --> to lift up the avg of online students, there must be some students who score much higher than classroom students do, hence D.

OA is A, but I can't justify why D is not correct.
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Re: Cheever College offers several online courses via remote [#permalink] New post 21 Mar 2012, 15:34
this is confusing and its only a 600 level question. I think its higher.
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Re: Cheever College offers several online courses via remote [#permalink] New post 21 Mar 2012, 22:03
selected D cant understand why its A, rejected A thinking it to be opposite answer.

any helpful explanation will be appreciated

thnx
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Re: Cheever College offers several online courses via remote [#permalink] New post 29 Aug 2012, 23:27
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The argument says that "average student grade for online course matched that for classroom-based courses" and "course withdrawals were weighted as equivalent to a course failure"
A) says that "Among students who did not withdraw, students enrolled in online courses got higher grades". This corresponds with the argument since withdrawals were considered as course failure; therefore the remaining students' average grades must be higher"

we cannot infer anything such in D) mentions and the word is somewhat too extreme "best grade"
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Re: Cheever College offers several online courses via remote [#permalink] New post 07 May 2014, 22:51
Cheever College offers several online courses via remote computer connection, in addition to traditional classroom-based courses. A study of student performance at Cheever found that, overall, the average student grade for online courses matched that for classroom-based courses. In this calculation of the average grade, course withdrawals were weighted as equivalent to a course failure, and the rate of withdrawal was much lower for students enrolled in classroom-based courses than for students enrolled in online courses.

If the statements above are true, which of the following must also be true of Cheever College?

(A) Among students who did not withdraw, students enrolled in online courses got higher grades, on average, than students enrolled in classroom-based courses.
(B) The number of students enrolled per course at the start of the school term is much higher, on average, for the online courses than for the classroom-based courses.
(C) There are no students who take both an online and a classroom-based course in the same school term.
(D) Among Cheever College students with the best grades, a significant majority take online, rather than classroom-based, courses.
(E) Courses offered online tend to deal with subject matter that is less challenging than that of classroom-based courses.



the average student grade for online courses = the average student grade for classroom-based courses
withdrawal= failure
withdrawal for online courses > withdrawal for classroom-based courses

so it can be deduced A : to have the same average with students in classroom-based courses, students in online courses should get higher grades on average to compensate the higher withdrawal.

D is not correct bcz in the argument we don't care about the best grades, higher grades is enough to justify the equation. consider the following scenario:

in classroom based courses:
total #enrolled: 30
#withdrawal: 1 (consider withdrawal score 0)
#best score 100/100: 3
if we consider passing score 50, and if we consider the worst case: # of who just passed : 26
ave= 3*100+ 26*50= 1600/30=53.3

in online courses:
total #enrolled: 30
#withdrawal: 5
#best score 100/100: 1
and consider the best case for this group: the remaining got 99/100

ave= (100+ 24*99)/30=82.53

so, in this case the average must be higher in classroom-based courses.
and we can see what is matter here is the average higher grades not the best grades.
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Re: Cheever College offers several online courses via remote [#permalink] New post 07 May 2014, 23:42
In order to reach the average grades of class room based courses, the only option is if the students who didn't withdraw achieved the higher grades than classroom based courses.

Thank you very much for sharing this qn
Re: Cheever College offers several online courses via remote   [#permalink] 07 May 2014, 23:42
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