medium · GMAT Verbal
A tech startup recently replaced all standard office chairs with high-end ergonomic models. Over the following six months, the software development team's output increased by 15%. The management concluded that the ergonomic chairs directly caused the increase in productivity by reducing physical discomfort.
Which of the following, if true, most weakens the management's conclusion?
- The ergonomic chairs took several weeks to be fully delivered and installed across all of the development team's workstations.
- The increase in software output was measured with the same feature-completion metric used before the chairs were replaced.
- Most employees reported that they found the new chairs more comfortable than the old ones.
- The ergonomic chairs are significantly more expensive than the standard chairs they replaced.
- The company hired several new senior developers during the same six-month period to help with the workload.
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