Two researchers observe aggressive behaviors displayed by preschool children. The first researcher records a large number of aggressive acts displayed within a one-hour period. The second researcher also records many aggressive acts during the same period. Since both researchers agree in their observations, it can be inferred that the research has reliability.

The correct answer is interrater

Is the degree of agreement between the evaluators. It is a count of how much homogeneity, or consensus, exists in the rates presented by several judges. In contrast, intra-observer is a score of consistency in data provided by the same person in multiple instances. Between evaluators and intra-evaluator requirements are aspects of test validity. How useful estimates are refined as tools given to humans, for example, determining whether a specific scale is appropriate for a particular variable. If several evaluators do not agree, either the scale is defective or the evaluators need to be re-trained.