medium · GMAT Verbal
A supplement company claims that its new pill improves memory, citing a study in which participants who took the pill scored higher on a memory test than participants who took nothing at all.
Which of the following, if true, most weakens the claim that the pill improves memory?
- Participants who took the pill were told it was a memory enhancer, while the comparison group was given nothing and told nothing.
- The pill also contains vitamins that contribute to general physical health.
- Memory performance naturally varies somewhat from one day to the next.
- The pill is more expensive than most competing memory supplements.
- Some participants in the study were considerably older than others.
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