Answer
Single-blind experiment: only the subject does not know which treatment he or she is receiving.
Double-blind experiment: neither the subject nor the researcher in contact with the subject knows which treatment the subject is receiving.
Work Step by Step
Single-blind experiment: For example, a doctor may be told that they are giving the patient a fake version of the drug.
Double-blind experiment: In this case, the doctor would be given the drug from researchers, preventing both the doctor and the patient from knowing whether or not it is real.
