The most commonly used descriptive statistics for a set of numerical scores are the mean and the ____

________ is defined as an inferred process within a person or animal, which causes that organism to move toward a goal or away from an unpleasant situation

a. Motivation b. A drive c. A value d. The need for achievement

Sigmund Freud's psychodynamic theory was based primarily on the use of ______ studies

a. case c. quasi-experimental b. correlational d. epidemiological