The defined content domain is well sampled. E.g., the SAT is supposed to have a moderately high level of criterion-related validity because it is a good predictor of achievement in college. Theories are only models of the world. Construct validity is relevant to assessing the adequacy of a measure intended to capture a theoretical abstraction. Norms Because psychological measurement is relative, test scores are usually interpreted by comparison to the scores of others.
Norms summarize the scores of a defined group, used for the purpose of comparison.
Usually, we are interested in a population , which is represented by a sample . Norms are almost always derived from the scores of the sample, to represent the scores of the population. Local Norms describe the performance of a relatively small, specific group which may be particularly relevant for comparison. Many tests have local norms in addition to broader national or regional norms. The selection of norms represents a major source of controversy in testing today.