This information is valuable to the broadcaster and it is important to provide it if you want to receive a QSL card from the station. The broadcaster uses this information to determine whether changes should be made in the times or frequencies used to broadcast to a particular area. The code is based on the numbers 1 to 5. Not all of the numbers will be the same, however. Interference as used with the code refers to man-made interference such as that from other radio stations or local electrical appliances.
Noise refers to natural noises such as static.