You call them a control group because you know what should happen - they should have their headaches go away. The positive control group would get something like Advil or Tylenol. If you want to test if a drug heals headaches more than other brands, you can have 3 groups: a positive control, a negative control, and the experimental group. Positive control = should show an expected result. Negative control = should show no result. Good answers here: Maybe another example would help!
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