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The av. math score on a state-wide proficiency exam for

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The av. math score on a state-wide proficiency exam for [#permalink] New post 12 Aug 2008, 05:48
00:00
A
B
C
D
E

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The av. math score on a state-wide proficiency exam for students attending X high school last yr was 20 points higher then the av math score for students attending nearby Y high school. Therefore, any student at Y high school wishing to achieve a better math score on next september's proficiency exam should transfer to X high school over summer.

which of the following statement, if true, would most significantly strenghten the conclusion drawn in passage above?

a) X high school offers its student a unique, week-long course just before they take the proficiency exam that has consistently proven effective in raising student scores.

b) one third of all the students who transfered to X high school the before taking the test got scores that are at least 20 points higher than the average score at Y hihg school

c) in past 5 yrs, the av score at Y high school has been rising at a faster rate than thas av score at X high school.
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Re: CR -- strengthen [#permalink] New post 12 Aug 2008, 06:18
I think is A. In B says that only one third of transfered students obtained a better score, and C weaken the conclusion
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Re: CR -- strengthen [#permalink] New post 12 Aug 2008, 06:19
Where are D and E answer choises? Out of these choises A seems to be my favourite.
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Re: CR -- strengthen [#permalink] New post 12 Aug 2008, 12:15
A provides support that test-takers will improve their score before they write their tests.
B is a statistic
C weakens
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Re: CR -- strengthen [#permalink] New post 12 Aug 2008, 16:51
Out of the three choices, A is the best.
Re: CR -- strengthen   [#permalink] 12 Aug 2008, 16:51
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