Wheel bearings or bad tires? on 1992 Acura Integra

Read the info on diagnosing bad rear wheel bearings. How do I distinguish between that and the possibility of a bad tire (right rear tire is pretty worn, left rear is in better shape)? The rumbling sound generally gets louder as the MPH increases. I hear the sound when going straight or turning left, but it goes away when turning right.

Asked by for the 1992 Acura Integra
jack up the car and spin the wheel. if it is a bearing, then you will hear it and feel it.

You can also switch wheels and if the noise follows the wheel, it's the tire.