What are conceptual variables?
From PsychWiki - A Collaborative Psychology Wiki
In experiment design, conceptual variables are abstract concepts that compose the basis of a research hypothesis. For example, describing the relationship between study time and grades. In other words, conceptual variables are abstract variables describe as the experimenter understands them or sees them.
Example / Application
Application: In this example each variable that the researcher is attempt to measure is clearly defined as he/she sees it fit.