When something can be changed or manipulated during an experiment or intervention it is defined as a:

Name: When something can be changed or manipulated during an experiment or intervention it is defined as a:
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A variable is an element, feature, or factor that is liable to vary or change during an experiment or intervention. It is the aspect of the experiment that can be changed or manipulated to observe effects on the outcome, distinguishing it from constants, which remain unchanged.

When Something Can Be Changed or Manipulated During an Experiment