Which term refers to entities that cannot be directly observed but are inferred on the basis of empirical evidence?

• A. Variables
• B. Hypothetical constructs
• C. Operational definitions
• D. Measures

Answer: (B)

Abstract constructs are ideas that you can’t see or measure directly, but you infer their existence from patterns in evidence you can observe. Think of motivation or anxiety: you can’t point to them and say "there it is," yet you infer how motivated someone is from their choices, persistence, and responses. That inferential nature is what makes them hypothetical constructs—abstract concepts built from empirical data to explain observed behavior.

In contrast, variables are the things you can observe or change, measures are the tools that quantify those observations, and operational definitions specify exactly how you will measure a construct in a study. So, the best fit for entities that cannot be directly observed but are inferred from evidence is hypothetical constructs.