Recently, debate has intensified over the "problem" of selective samples in psychological research. Scientists
have coined the term WEIRD to describe the vast majority of participants in psychological studies:
What are some potential threats to the internal and external validity of a study that employs WEIRD subjects? What kinds of studies are at particular risk? How might we fix these problems systematically, in our research endeavors?
Bring in at least one outside source when answering the question(s).