standard scores range
As a standard score gives a position in relationship to a reference group, the score by itself is meaningless without knowing the position of the student when compared to all students who took the same test. A standard score of 90, the beginning of the average range, corresponds to a percentile rank of 25.A standard score of 110, the uppermost end of average, has a percentile range of 75. So a child at the 30 th percentile on a test of reading or math is performing within the region of what would be considered âaverage.â.With percentile ranks and standard scores, the comparison group matters.s a standard score gives a position in relationship to a reference group, the score by itself is meaningless without knowing the position of the student when compared to all students who took the same test. A standard score of 90, the beginning of the average range, corresponds to a percentile rank of 25.
A standard score of 100 would also be at the 50 th percentile rank. The middle half of these standard scores falls between 90 and 110. Wechsler SCALED SCORES have an average (mean) of 10 and a standard deviation of 3.A scaled score of 10 would also be at the 50 th percentile rank.-SCORES have an average (mean) of 50 and a standard deviation of 10. A T-score of 53 would be at the 62 nd percentile rank, Stanine 6. The middle half of T-scores falls between approximately 43 and 57.