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Controls provide references, or standards, with which to compare data and results. In science, the need for valid comparisons is crucial. Designing adequate controls makes these comparisons possible. Many of the flaws of early scientific endeavors (causing very slow progress), were caused by lack of adequate controls. Routine controls now include alternate hypotheses, differential diagnoses, and peer reviews in addition to others designed into data collection and generation and lab procedures.

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14y ago

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