Examlex
OPEC is a:
Independent Variable
A variable in an experiment that is manipulated to observe its effects on a dependent variable.
Internal Validity
The extent to which a study provides evidence that a causal relationship exists between the variables it examines, free from confounding factors.
Random Assignment
Use of a random "chance" procedure (such as a random number generator or coin toss) to determine the condition in which an individual will participate.
Confounding Variable
A factor other than the independent variable that might produce an effect in an experiment, leading to inaccurate results if not controlled.
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