easy · GMAT Verbal
A school introduced a new tutoring program. Test scores rose the following semester. The principal concludes that the tutoring program caused the higher scores.
Which of the following, if true, would most weaken the principal's conclusion?
- The tutoring program was held twice a week.
- The school's tutoring program was well attended.
- The tutoring sessions lasted one hour each.
- The school also adopted an easier standardized test that same semester.
- Students said they enjoyed the tutoring sessions.
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