To Make Sure That Groups of Participants in an Experiment

question 157

Multiple Choice

To make sure that groups of participants in an experiment are not generally different from each other before the experiment begins, the experimenter ____.

• A) uses an objective observer to assign participants to groups
• B) uses random assignment to assign participants to groups
• C) assigns participants to groups by himself or herself without interference by anyone else
• D) assigns participants to groups on the basis of an unimportant trait such as hair color

---

Definitions:

Neurotransmitter Deficiencies

refer to the lack or imbalance of chemicals in the brain, which can affect mood, thought processes, and physical functions.

Biological Psychology

A field of psychology that examines how physiological processes and biological structures influence behavior and mental states.

Mood States

Temporary emotional states that influence a person's outlook and perceptions, distinct from personality traits or emotional disorders.

Biological Psychologist

A scientist who studies the biological underpinnings of behavior, cognition, and emotions, often focusing on the brain and nervous system's roles.