medium · GMAT Verbal
A new tutoring program was introduced at Lincoln High. After one year, math scores there rose 15%. School officials conclude that the tutoring program improved student performance.
Which of the following, if true, most strengthens the officials' argument?
- The students who took part generally reported that they had enjoyed the tutoring sessions.
- No other change to the math curriculum or teaching staff occurred at Lincoln High during that year.
- Reading scores at Lincoln High, on the same standardized assessment, also rose by a comparable margin that year.
- Math scores rose by a closely similar amount in a neighboring district that had introduced no tutoring program.
- The new tutoring program turned out to be fairly costly for the school to design, staff, and implement that year.
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