medium · LSAT Logical Reasoning

Students who participate in the high school's voluntary peer-tutoring program earn higher grades than students who do not participate. The principal concluded that the peer-tutoring program improves students' grades.

Which one of the following, if true, most strengthens the principal's conclusion?

  1. With random peer-tutoring assignment, assigned participants earned higher grades than assigned nonparticipants.
  2. The peer tutors are themselves high-achieving students.
  3. Students joining peer tutoring tend to be more academically motivated than students who do not join.
  4. Grades across the school have risen modestly over the past several years.
  5. Assigned tutoring students knew their status and received additional praise from teachers throughout the term.

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