Validity The extent to which a test measures what it was intended to measure.
Variable In an experimental setting, a factor that varies in amount and kind.
Variable-interval schedule A schedule of reinforcement in which a reinforcer is delivered for the first response made after a variable period of time whose average is predetermined.
Variable-ratio schedule A schedule of reinforcement in which a reinforcer is delivered for the first response made after a variable number of responses whose average is predetermined.
Psychologyintro
Psychology Glossary V
Psychology Quote
A belligerent state permits itself every such misdeed, every such act of violence, as would disgrace the individual.
Sigmund Freud