What does a negative control group signify in an experiment?

A negative control group is essential in experiments as it serves as a baseline to compare against experimental groups. When this type of control group is included, it indicates that no response is expected from the subjects. This lack of response showcases the effects of the experimental treatment against a backdrop of what happens in the absence of that treatment.

In scientific experiments, a negative control group helps to identify the influence of external variables, ensuring that any observed effects in the experimental group can be attributed to the treatment under investigation. By having a group that does not receive the treatment and is not expected to show a change, researchers can ascertain whether the treatment itself caused any measured effects or whether those effects might have occurred due to other factors.

This clarity provided by a negative control is crucial for validating experimental results and interpreting findings within the broader context of the research question.