Gordon Allport's extensive list of personality trait descriptors was condensed in the first well-known trait theory. This new list of sixteen traits was theorized by __________ in the 1960s

Since ADHD has been added to the DSM, the number of ADHD diagnoses in the United States has skyrocketed

Indicate whether this statement is true or false.

The degree to which treatment effects in an experiment can be accounted for by the

theoretical mechanisms represented in the independent variables is called _______. a. face validity c. internal validity b. construct validity d. external validity