What is an example of an experiment control group?

An example of a control group in an experiment is when researchers study the effect of a new drug on blood pressure. In this scenario, one group of participants receives the drug (the experimental group), while a separate group receives a placebo, which contains no active ingredients (the control group). Both groups are treated identically in all other aspects, allowing researchers to compare the effects of the drug against the placebo. This helps to ensure that any observed differences in blood pressure can be attributed to the drug itself, rather than other factors.