In some experiments, several identical groups are set up, keeping conditions similar among them. In the _____ group, a change is deliberately introduced. In the _____ group, this change is not introduced. In this way, the researcher can determine if the change has an effect.

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In experimental research, the test group (or experimental group) is the one in which a change or intervention is introduced to observe its effects, while the control group is kept under normal conditions without the introduced change, serving as a baseline for comparison.

In Some Experiments, Several Identical Groups Are Set Up, Keeping