There is a distinction that one learns about on the first day of a course in psychological research methods. It is the difference between internal and external validity. Internal validity is ...

There is a distinction that one learns about on the first day of a course in psychological research methods. It is the difference between internal and external validity. Internal validity is ...

The information needed to determine the internal and external validity of an experimental study is discussed. Internal validity is the degree to which a study establishes the cause-and-effect ...

The maturation threat can operate when biological or psychological changes occur within subjects and these changes may account in part or in total for effects discerned in the study. For example, a ...

Experimental economics is a sub‐discipline that employs controlled laboratory and field settings to investigate economic behaviour, test theoretical predictions, and inform policy. By designing ...

In everyday language, the term validity is typically used to describe something as being trustworthy or legit. It's meaning in psychology suggests something similar—it's all about whether we can trust ...