Interpreting Item Results Interpreting Item Results Figure 1. In Figure 1, Item Number is the number of the item on the test. Total refers to how many students answered the item correctly.
Difficulty is the percentage of students answering the item correctly.
The MCI is the modified caution index for items. These cautionary items display atypical response patterns with easier items incorrectly answered by higher ranking students and harder items correctly answered by lower ranking students. Discrimination is an index that compares how the most able students performed on an item to how the least able students performed. The point biserial also indicates how well an item differentiates between the most and least able students. Using multiple statistical indices of item functioning may help identify deficiencies either in the teaching or the test.