A researcher gives a new drug to 50 volunteers and later evaluates their behavior,reporting that the drug made them happier than similar people who did not volunteer.What is wrong with this study?

Question

A researcher gives a new drug to 50 volunteers and later evaluates their behavior,reporting that the drug made them happier than similar people who did not volunteer.What is wrong with this study?​

Quizplus · Accepted Answer

This study lacks a proper control group, random assignment, and blind observation. Without these elements, it is impossible to determine if the drug is truly responsible for the observed effects on behavior. Additionally, the study assumes that the volunteers are similar to non-volunteers, which may not be accurate.

A Researcher Gives a New Drug to 50 Volunteers and Later