Examlex
How has Piaget's theory of cognitive development been viewed by later researchers?
Internal Validity
The certainty with which results of an experiment can be attributed to the manipulation of the independent variable rather than to some other, confounding variable.
Ceiling Effect
Failure of a measure to detect a difference because it was too easy (also see floor effect).
Strongest Manipulation
In experimental research, the use of the most extreme or powerful version of the independent variable to assess its effects.
Nonsignificant Findings
Results of a statistical analysis that do not meet the criteria for significance, indicating that any observed effect might be due to chance.
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