The Hawthorne study to determine the relationship between the intensity of illuminations and worker's productivity was done by:

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E6 Principles and Practice of NURSING Management Leadership for BSc Nursing 3rd Edi Jogindra Vati — Subpart A (pp 26-339 of 1017) p. 74-76
E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 3405-3407
Practise the full JODHPUR AIIMS SNO-2018
Attempt every question from this paper in a timed mock, then review the full solution for each one.