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 a blend of vitamins and minerals that are widely known to contribute to general physical health.
- Memory performance can naturally vary by a small but noticeable amount from one day to the next, even within the same person.
- The pill is considerably more expensive for an ordinary customer to purchase than nearly all of the competing memory supplements sold today.
- Some of the participants who took part in the study happened to be noticeably older than several of the other participants were.
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