ITEM ANALYSIS AND VALIDATION
Benefits of Item Analysis
- It provides useful information for class discussion of the test
- It provides data which helps students improve their learning
- It provides insights and skills that lead to the preparation of better tests in the future
Item Difficulty
- the number of students who are able to answer the item correctly divided by the total number of students
Item Difficulty = number of students with correct answer/total number of students
Difficulty Index
Index of Discrimination
- tells whether it can discriminate between those who know and those who do not know the answer
- The difference between the proportion of the upper group who got an item right and the proportion of the lower group who got the item right
Index of Discrimination=DU - DL
