Which group in an experiment does not receive the experimental manipulation but undergoes a similar procedure?

The correct response highlights the role of the placebo control group in an experiment. This group is crucial as it allows researchers to assess the effects of the experimental manipulation by providing a comparison against a group that does not receive the treatment.

Members of the placebo control group undergo a procedure that mimics the experimental treatment, but they do not receive the actual intervention or manipulation. This is important for isolating the effects of the treatment and eliminating bias. By comparing outcomes between the treatment group and the placebo control group, researchers can better determine whether observed changes are due to the intervention or other factors, such as participants’ expectations.

The treatment group, in contrast, does receive the experimental manipulation, making it essential for measuring the effectiveness of the intervention. Random assignment refers to how participants are allocated into either the treatment or control group, ensuring that each individual has an equal chance of being assigned to either condition, thus reducing bias. An experimental group is synonymous with the treatment group, focusing on those who receive the manipulation.

In essence, the placebo control group serves as a baseline without the manipulation, aiding in the determination of the treatment's actual impact.