Think about it. If you're watching "Ghost Hunters" or "Ghost Adventures" or some other ghost hunting program, usually investigators hear noises in another room. Why do you think that is?
|Haunted Hospital room. Cr: Lovethesepics.com|
Another personality trait th may be the reason a ghost makes a noise in another room instead of in the direct presence of someone, is that the entity may enjoying playing/toying with people, and trying to scare them. People who were controlling or power hungry in life, would be controlling in death. Those kinds of people who are now earth-bound ghosts, would enjoy scaring people from a room away, making them wonder what happened in another room.
Whatever the reason for a ghost making a noise from another room- it's all to get attention to let the living know they're dwelling in a place, and they want help crossing into the light.