Name: Assignment #5: Measure of Central tendency Dispersion and Standardized scores. Date 1. According to the textbook t represents the true score e represents the test score while o represents obtained score. 2. It is impossible to assume that a test score is true score since there is always some level of error. The test score does not necessarily represent the true score of the test takers since they could also be influenced by external factors such as techniques on the different test takers. The item discrimination should however be high to enable you to determine clearly the effect of each technique on the different test takers. A norm-referenced test is usually meant to determine which technique is best suited for each test taker rather than which is the best weightlifting technique and which one is not. Weak item discrimination may be used in the event that you want multiple correct answers from your test takers. [...]
Use this book! Sharon Robinson Kurpius and Mary Stafford (2006), Testing and Measurement: A User Friendly Guide, Sage Publication, Thousand Oaks, CA.