easy · GMAT Verbal
A factory added short rest breaks and defect rates declined. The manager concludes the breaks reduced defects.
Which new fact most strengthens the conclusion?
- Defect rates had already been declining at the same rate before rest breaks and continued that trend afterward.
- Very few of the people measured actually used the change.
- A separate change occurred at the same time and could explain the result.
- Comparable shifts using the new break schedule had fewer defects than shifts using the old schedule.
- The organization expected the result to improve before collecting any data.
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