Final answer:
The MMPI-A utilizes T-scores for interpreting test results. T-scores are a standardization scale allowing comparison to a national sample, distinguishing them from base rates which indicate response frequency in a population.
Step-by-step explanation:
The Minnesota Multiphasic Personality Inventory-Adolescent (MMPI-A) uses T-scores to interpret the test results. These T-scores are used to compare an individual's score with a nationally representative sample of individuals. In the context of the MMPI instruments, T-scores are a standardization scale that helps in interpreting the scores from various scales of the inventory, indicating how far a person's score deviates from the average score of the reference population. Base rates, on the other hand, would look at how frequently certain responses appear in the reference population, which is a different statistical concept not typically used for scoring on the MMPI-A.