Example: Placebos Study
Placebos are necessary for studies and clinical trials. When doing statistical analysis, you’ll have a controlled-group that’ll receive the drug or device in question for actual treatment and perhaps another group that’ll receive a type of “sugar pill” or something else that won’t treat the illness or condition, but the patient or subject is led to believe that it will do something. It is interesting to note in an experiment where patients are given a placebo, whether they are told it is fake or not, a given percentage will still have positive physiological responses. Placebos have their appropriate times to be used while other times it should not be used at all.
https://www.ncbi.nlm.nih.gov/pmc/articles