a control group is usually optional in an experiment

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1. Solved 1) Why is it important that an experiment include a

   

2. Solved What is the control group, experimental group,

   

3. What is the purpose of a control group in an experiment?

   

4. Solved 1. Is there a control group in this experiment?

   

5. Solved The purpose of a control group in an experiment

   

6. Solved Saved The purpose of a control group in an experiment