What type of definition is the following? "CDD lymphocyte counts are the measure of immune function."
A) Conceptual
B) Operational
C) Physiological
D) Theoretical

Question

Quizplus · Accepted Answer

An operational definition is derived from a set of procedures or progressive acts that a researcher performs to receive sensory impressions that indicate the existence or degree of existence of a variable. An operational definition is developed so that a variable can be measured or manipulated in a concrete situation.
A conceptual definition is the theoretical meaning of a variable.
These are physiological measurements, but the terms within the stem of the question are not defined physiologically. A physiological definition would provide an accurate description of the concept on a biologic level.
The conceptual definition can sometimes be a theoretical definition.

What Type of Definition Is the Following? "CDD Lymphocyte Counts