Why is a control group needed in an experiment?

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1220519

2026-09-06 15:41

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  1. The control group do not have if thing.
  2. And the experimental group have if thing.
  3. The if thing means that may be this answer or lab could be right or not.

By CHOUDHARY WAQAS from USA NY Brooklyn MIDwood HS. 2009

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