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An experiment was designed to study the potential impact of alcohol consumption on emotional stability. A specification of the variables and procedures used to measure emotional stability illustratesa. the independent variable.b. an operational definition.c. the double-blind procedure.d. random assignment.e. the dependent variable.

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Answer:

b. an Operational Definition

Explanation:

An operational definition is the expression of conceptual model (or procedural statement)  used to define the terms of a method required to determine the essence of an object or  an occurrence and its characteristics including period, volume, spatial expansion,  chemical properties.