Question

When observational data are being collected, the observer’s presence may cause a person to behave differently, a phenomenon known as?

Answer 1

When observational data are being collected, the observer’s presence may cause a person to behave differently, a phenomenon known as reactivity.

To add, reactivity is a phenomenon that occurs when individuals alter their performance or behavior due to the awareness that they are being observed. The change may be positive or negative, and depends on the situation.