Many Psychology Departments in the United States Have Subject Pools

Multiple Choice

Many psychology departments in the United States have subject pools. Undergraduate students enrolled in introduction to psychology are often awarded extra credit or sometimes even required to complete research studies in order to earn points towards their class. The issue with relying on WEIRD samples through a subject pool in psychological research is most likely a result of what kind of sampling?

A) Representative sampling
B) Random sampling
C) Snowball sampling
D) Convenience sampling