medium · GMAT Verbal
A manager at a company notes that employees who used the new productivity software completed 15% more tasks than those who used the old software. He concludes that the software upgrade caused the increase.
Which of the following, if true, most weakens the manager's conclusion?
- The old productivity software will no longer be supported or updated by its developer next year.
- Several employees complained that the new productivity software was difficult to learn at first.
- No productivity software of any kind has ever improved task-completion rates in any company, under any conditions.
- The employees who were given the new software were the company's top performers even before the upgrade.
- The new software costs nearly twice as much per user license each month as the old software the firm replaced.
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