medium · LSAT Logical Reasoning

A study found that elementary school students who participated in a 'chess in schools' program scored 10% higher on standardized math tests. The program organizers claimed that learning chess develops the logical thinking skills necessary for mathematical success.

Which of the following, if true, most seriously weakens the organizers' claim?

  1. The schools that volunteered for the chess program were concentrated in wealthy districts with unusually high per-pupil funding.
  2. Students who skipped the chess program showed no notable change in their own math scores across that same lengthy period.
  3. The standardized math tests centered on logic-heavy items of exactly the deductive sort that the chess program was meant to develop.
  4. Chess demands recognition of intricate positional patterns, a skill that also underlies many branches of advanced mathematics today.
  5. Chess instruction is far and away the single surest method known for raising elementary students' overall math achievement.

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