Examlex
The case of ozone depletion is
Experimental Group
This is the group in an experiment that receives the variable being tested.
Control Group
In an experiment, the group that does not receive the treatment being tested, used as a benchmark to measure how the other tested subjects do.
Placebo Treatment
A simulated or otherwise medically ineffectual treatment given to deceive the recipient for psychological or experimental reasons.
Random Error
Variability in data that arises due to chance and affects measurements in unpredictable ways.
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