Common Types of Standard Scores:
- Z-Scores: These scores are scaled on a number line ranging from -4 to 4 with zero being in the middle. On this scale, zero is average. Positive scores are above average, and negative scores are below average.
- T-Scores: These scores range from 10 - 90 in intervals of 10 points. Fifty is average on this scale.
- Stanines: The stanine scale is also called the standard nine scale. These scores range from 1 - 9 with five being average. Scores below five are below average. Scores above five are above average.
Some test publishers create their own scales of standard scores. Interpretations of those scales and what they mean are available through your child's examiner.