In this type of study, none of the participants know about the variables that might affect the results, until the end. This is usually done to avoid a placebo effect. It is considered to be an important tool in several scientific areas, especially in medicine and psychology.
There is a type of study where not even the researchers know about the dependent variables. This is called a double-blind study.
Personal distance - This zone extends from 18 inches to 4 feet. We reserve if for friends and acquaintances and ordinary conversations. This is the zone in which Hall would have preferred speaking with the South Americans. Idk maybe
