Interest group membership is often one percent or less of the potential membership (where potential membership is the population that agrees with the group's goals)

The way to avoid confounding two variables is to

A) Vary measurement procedures throughout. B) Hold constant the variable the researcher is most interested in. C) Be especially aware of possible cohort effects. D) Make sure the variables vary independently.

For the market to operate as Adam Smith proposed, the following conditions must exist: __________

a) the ability of people to exert demand, competition between those supplying goods and services, and access to information regarding goods and services b) remarkable sales skills by a superior sales staff c) creative marketing, packaging, and the ability to project need d) forceful marketing, along with creative sales ability