medium · GMAT Verbal
A study of 500 patients found that those who took a herbal supplement reported 30% less joint pain after a month. The researchers concluded the supplement is an effective treatment for joint pain.
Which of the following is an assumption required by the argument?
- No competing new treatment or lifestyle change among the patients accounts for the reduction in reported pain.
- The herbal supplement is safe for patients to keep taking over an extended period of long-term daily use.
- Patients accurately measured their own pain levels using a validated clinical scale administered by the study team.
- The 30 percent reduction in joint pain would persist for at least one full year of continued use.
- The herbal supplement relieves joint pain far more effectively than any traditional over-the-counter painkiller available.
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