MCAT Practice · Reasoning about the Design & Execution of Research

MCAT Question: A research team investigated the effectiveness of a new meditation…

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A research team investigated the effectiveness of a new meditation app in reducing stress in healthcare workers. They recruited 100 nurses working in a busy hospital and randomly assigned them to two groups. One group used the meditation app for 10 minutes daily for six weeks, while the other group received no intervention. Both groups completed standardized stress questionnaires before and after the intervention period. The researchers found a significant decrease in stress scores among the app users compared to the control group, concluding that the app is effective in managing stress in healthcare workers. Which of the following factors MOST LIKELY limits the generalizability of the study's findings to the broader healthcare worker population?

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