The famous Hawthorne Effect findings were reanalyzed and it was concluded:

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There is evidence to support all three of these possibilities. While the original study found increased productivity when lighting was adjusted, subsequent reanalyses have suggested that there were other factors at play, including the possibility that workers may have felt compelled to work harder because they were being observed by researchers they thought were company spies. Additionally, it's possible that worker turnover contributed to the improved productivity rather than changes in the work environment itself. Thus, all of these explanations could be true at the same time.

The Famous Hawthorne Effect Findings Were Reanalyzed and It Was