Teacher Daryl gave a test in Physics. Item number 5 has a difficulty index of 0.85 and discrimination index of -0.10. What should teacher Daryl do?*1 pointa. Retain the item.b. Reject the item.c. Make the item bonus.d. d. Reject it and make the item bonus.
Question
Teacher Daryl gave a test in Physics. Item number 5 has a difficulty index of 0.85 and discrimination index of -0.10. What should teacher Daryl do?*1 pointa. Retain the item.b. Reject the item.c. Make the item bonus.d. d. Reject it and make the item bonus.
Solution
Teacher Daryl should reject the item. The difficulty index of 0.85 indicates that the item is too easy as it is correctly answered by 85% of the students. The negative discrimination index of -0.10 suggests that the item does not differentiate well between high and low ability students. In fact, it indicates that low ability students are more likely to answer the item correctly than high ability students, which is not desirable. Therefore, the item should be rejected.
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