easy · GMAT Verbal

A gym replaced old treadmills, after which membership renewals increased. The gym credits the new treadmills.

Which new fact most strengthens the conclusion?

  1. Renewals had already been rising at the same rate before the treadmills were replaced and kept that trend afterward.
  2. Members who used the new treadmills renewed more often than comparable members who did not.
  3. Very few of the people measured actually used the change.
  4. A separate change occurred at the same time and could explain the result.
  5. The organization expected the result to improve before collecting any data.

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