What is the purpose of the test statistics?
The aim of testing is to match each student with a score that reflects 1) the amount learned relative to a norm group—the current class or previous classes, or 2) an absolute proportion of amount learned based on a very well constructed mastery test. For either style of testing, the only method that will provide information on the quality of the test is an item-by-item examination. Careful study of the statistical analysis output provides a basis for assessing the reliability and validity of a test and improving the quality of future classroom tests. The following are examples and explanations of the statistics that appear on Opscan results.
