Field experiment.

A field experiment is a research method conducted in a real-world setting rather than __________ _____ ___ _________ ________ ____ ________ ______ __________ _____ _______.
________ ___ ______ __________ ________ ______ _______ _______ _________ __________ _______.
__________ _______ __________ ________ ___.
____ _________ ____ _____ ___ _____ ________ ___ ______ _______.
_______ _____ _______ ______ _________.
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