medium · GMAT Verbal
After a school adopted a new mathematics curriculum, its students' average score on the year-end standardized test rose by 12 points, the same test given at every school in the district. School administrators concluded that the new curriculum improved students' actual understanding of mathematics.
Which of the following is an assumption on which the administrators' conclusion depends?
- The score rise was not mainly driven by teachers narrowing instruction to drill the test's formats.
- This district's standardized test is a more rigorous measure of mathematical ability than other districts' tests.
- Every single student at the school improved on the standardized test after the curriculum changed.
- The school's teachers found the new curriculum considerably easier to plan lessons around than the old one was.
- Other schools in the district did not adopt any comparably effective new mathematics curriculum that same year.
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