A sample in which not everyone in the population has an equal or known chance of being selected is called a(n) sample

Which of the following is true for within-subjects designs?

A) There must be at least three conditions manipulated. B) Participants are all randomly assigned to conditions. C) Each participant serves as his or her own control. D) They require more participants than do between-subjects designs.

What group of countries is characterized by localized power bases with weak central authority and political systems socialized in the social order of the Soviet Union?

A. the Middle East B. the Caribbean C. the South Asian group D. the "Stans"