Ursula Works in an Office

Multiple Choice

Ursula works in an office. One day, her boss tells her that researchers will be in the office to observe productivity. Because she knows she is being observed, Ursula finds that she is working harder than she normally does. What is this an example of?

A) the placebo effect.
B) the Heisenberg principle
C) a single-blind study
D) the Hawthorne effect