PSYC 3250 Chapter Notes - Chapter 10: Total Correlation, Item Response Theory, The Item
2 Mar 2016
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Many of the most widely used tests contain a number of mc items each of which is designed to measure the same attribute/content. Best example here would be of scholastic aptitude. There is usually a correct answer (1) and incorrect answer (0). The total test score is the sum of the scores on all the items. Item analysis: refers to a loosely structured group of statistics that can be computed for each item on a test. (page 202). The exact choice and interpretation of the statistics that make up an item analysis are determined by the purpose of the testing and the person designing the analysis. It can help us increase the understanding of tests, why a test shows specific levels of reliability and validity. The reliability coefficient reveals something about the effects of measurement errors on test scores while the validity coefficient reveals something about the accuracy of the predictions that are based on test scores.
