Devon Is Running an Experiment in Which Children Are Observed

Devon is running an experiment in which children are observed interacting with simple toys, and their behavior is coded based on different categories. Devon has two experimenters observing and coding the behavior. Devon computes a correlation coefficient to see if the two experimenters produce similar scores. Which of the following describes how Devon is attempting to verify his observational method?

A) content validity
B) concurrent validity
C) test-retest reliability
D) inter-rater reliability

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