Which term describes intrinsic variations among participants that can influence measurements of the dependent variable?

• A. Participant variables
• B. Independent variable levels
• C. Control group
• D. Debriefing

Answer: (A)

Intrinsic differences among participants that can influence measurements of the dependent variable are described as participant variables. These are characteristics each person brings to the study—such as age, gender, personality, mood, or prior experience—that the researcher does not manipulate. Because these traits vary across individuals, they can affect how someone responds to the experimental conditions, potentially shaping the observed outcome. Random assignment helps distribute these differences evenly across groups, reducing their impact, while researchers may also measure and control for them statistically if needed. This concept is distinct from manipulating the independent variable (the factor being tested), from a control group (which serves as a baseline without the manipulation), and from debriefing (the post-study explanation given to participants).