Developing a belief because of data that support that belief relies on what method of knowing?

In ________ research, we observe two or more groups that are distinguished on the basis of one or more preexisting variables

A) Correlational B) Random sampling C) Differential D) Experimental Fill in the blank with the correct answer.

By the "power to persuade," Richard Neustadt means that a president must have

A. the ability to bargain. B. the ability to deal with adversaries. C. an ability to choose priorities carefully. D. Options A, B, and C are true. E. None of the above is true.