medium · GMAT Verbal
A software company found that engineers who complete an optional two-day 'code review workshop' introduce, on average, thirty percent fewer bugs in production over the following quarter than engineers who skip the workshop. The company's engineering director concludes that requiring every engineer to attend the workshop would reduce the company's overall production bug rate by roughly thirty percent.
Which of the following, if true, most weakens the engineering director's conclusion?
- Engineers who voluntarily sign up for the optional workshop tend to already be the most conscientious and detail-oriented members of their teams.
- The workshop covers material that experienced engineers describe as a useful refresher on best practices they learned early in their careers.
- Running the two-day workshop for every engineer at the company would require temporarily reassigning several senior staff to serve as instructors.
- A small number of engineers who attended the workshop said they found the pace of the sessions somewhat too slow for their skill level.
- The company's production bug-tracking system has recorded software defects consistently and without significant changes in methodology for several years.
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