easy · GMAT Verbal
A company added a live-chat button, and online purchases rose. Management concludes that live chat increased purchases.
Which new fact most strengthens the conclusion?
- Purchases had already been rising at the same rate before live chat and continued along 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.
- Visitors who used live chat purchased at a higher rate than similar visitors who did not.
- The organization expected the result to improve before collecting any data.
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