Raw score (add up scores in category).
: based on population.
Types of norms:
percentiles, age equivalent, standard scores (ex: Weschler).
mean, median, and mode; score in the middle (extremes).
Variance and standard deviation: Variance is SD squared
Standard deviation (SD)
how far from mean; get mean from SD.
68% fall below and above 1 SD; average above 34% above or below the SD (ex: distribution of mental health scores will approximate the normal curve).
negative-too many easy questions; positive-too many hard questions; median is correct score.