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Which of these serves as a reference for comparison during a scientific investigation?
Outcome variable (dependent variable)
Test variable (independent variable)
Control group
Hypothesis

Respuesta :

 The control group is the comparison group, you compare the results of the treatment group with the control group during a scientific investigation in order to see if the manipulation of the independent variable resulted in any change in what is being tested.  

Answer:

Control Group

Explanation:

Control Group is the group where no variable has been changed for it and it’s how something normally would be.