Dr. Leising conducts observational studies of adolescents interacting with peers during problem-solving tasks. She records each 30-minute interaction and then has three different research assistants in her laboratory code the adolescents' prosocial behaviors. She is interested in determining how much agreement there is among the three coders so she calculates a correlation coefficient as a measure of:  单项选择题

A

external validity

B

interrater reliablity

C

test-retest reliability

D

internal relability

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