When a studie is designed so that neither the subjects nor the experimenters known which subjects are in the treatment group and which ones are in the control group, the study is called a _____ experiment. A) double-blind B) placebo-effect C) biased D) controle
I think the answer is double blind because if the experimenters nor the subjects know which subjects are in the treatment group or the control group, they are both in the unknown. Double blind is pretty close to that, so i hoped i helped
