Final answer:
When fitting only one ear, it is best to fit the ear with the worst pure tone and discrimination results in order to provide the appropriate level of amplification or correction for their hearing loss.
Step-by-step explanation:
When fitting only one ear, the best rule would be to fit the ear with the worst pure tone and discrimination results. Pure tone testing assesses the ability to hear specific frequencies, while discrimination testing measures the ability to distinguish between different sounds. By fitting the ear with the worst results, it ensures that the patient receives the appropriate level of amplification or correction for their hearing loss.