Final answer:
The golfer pulling his drive into the trees due to being observed during the backswing is an example of the Hawthorne effect.
Step-by-step explanation:
The Hawthorne effect refers to the phenomenon where people change their behavior because they know they are being observed as part of a study. In the given scenario, the golfer consciously tries not to pull his drive, but the camera going off during his backswing causes him to pull his drive into the trees. The awareness of being observed altered his behavior, leading to a different outcome than intended.
This effect is often seen in social research studies where participants modify their behavior due to the knowledge of being observed. It is important for researchers to consider and account for the Hawthorne effect in their studies to ensure accurate results.