Control groups can also be separated into two other types: positive or negative.
Positive control groups are groups where the conditions of the experiment are set to guarantee a positive result. A positive control group can show the experiment is functioning properly as planned.
Negative control groups are groups where the conditions of the experiment are set to cause a negative outcome.
Control groups are not necessary to all scientific experiments. Controls are extremely useful where the experimental conditions are complex and difficult to isolate.
Experiments & VariablesWhat Is an Experiment?
What Is a Variable in Science?
What Is an Independent Variable?
What Is a Dependent Variable?
What Is an Experimental Group?
Difference Between Control and Experimental Group