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The av. math score on a state-wide proficiency exam for [#permalink]
12 Aug 2008, 06:48
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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.