A researcher studies presidential approval polls and finds the following values: 46, 46, 48, 49, 51, and 52. What is the mean approval rating?

Who is primarily responsible for the development of "the experimental analysis of behavior"?

A) E. L. Witmer B) J. B. Watson C) B. F. Skinner D) R. A. Fisher

The fluidity of alliances is underscored by __________.

A. liberals B. anarchists C. realists D. idealists