he marks 120 etc refer top a standardised score. The norm would be 100.
Statistical error gives scores within 2 standard deviations as being " average" So any standardised score between 85 and 115 is considered statistically to be teh " norm for that particular sample. Scores above 115 are therefore "above the norm"
Imagine a hill sloping up to a peak (the norm) and then slowly sloping down again...
The succesful scores would be in the right hand "tail"
The Kent test is looking for 1 at least "high average"and 2 "above average" scores.
The raw scores are turned into standardised scores by looking at the whole range of results (weighted for age as well) so that each year the top scoring children pass.
My brain hurts now!![/img]