The small group selected by pollsters to represent the entire population is called a

An opinion poll is when a pollster (the person who is conducting the specific poll) ask the same question to many people in order to identify a certain behavior or opinion about something, sometimes a small group is selected for the poll to represent a whole of population.

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.