Editing Accuracy and precision (section)

==In psychometrics and psychophysics==
In [[psychometrics]] and [[psychophysics]], the term ''accuracy'' is interchangeably used with [[Validity (statistics)|validity]] and ''constant error''. ''Precision'' is a synonym for [[Reliability (statistics)|reliability]] and ''variable error''. The validity of a measurement instrument or psychological test is established through experiment or correlation with behavior. Reliability is established with a variety of statistical techniques, classically through an internal consistency test like [[Cronbach's alpha]] to ensure sets of related questions have related responses, and then comparison of those related question between reference and target population.{{Citation needed|date=July 2009}}