The US constitution uses federalism to divide governmental powers between the federal government and individual states government. The 10th amendment tells us that all powers not granted to the federal government are reserved to the states
I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
I’m quite unsure to be honest but I think it’s Social Anxiety.
