The reports indicate that standard scores have a mean of 100 and a standard deviation of 15. What does that mean?
Standard scores with a mean of 100 and a standard deviation of 15 are a common metric for many individually administered achievement and intelligence tests. A standard score indicates the position of an individual’s score or test performance relative to the scores of others in the test’s normative sample, which in the case of the BASI test is designed to represent the general population of U.S. students at the same grade level as the examinee. For example, a Vocabulary subtest standard score of 115 indicates that the examinee performed one standard deviation above the mean compared to others at the same grade level in the general population.
