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The bulk of the nation's output is produced by:
Correlated
When two or more variables are related in some way, indicating that changes in one variable are associated with changes in another.
Experiment
A scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
Hypothesis
A proposed explanation for a phenomenon, made as a starting point for further investigation, often testable by experimentation.
Laboratory Observation
The process of watching subjects in a controlled environment to gather data or test hypotheses.
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