In scientific investigations a researcher must clearly define the variables under study by precisely describing how they will be measured or controlled.These definitions are referred to as

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Operational definitions are definitions that describe how variables will be measured or manipulated in a scientific investigation. These definitions are essential for ensuring that data collected is accurate, precise, and replicable. Objective, precise, and dictionary definitions are not specific enough for scientific investigations.

In Scientific Investigations a Researcher Must Clearly Define the Variables