MEASURES OF CENTRAL TENDENCY
.1 ITEM DISCRIMINATION
BUILDING ITEM BANK
Item discrimination refers to the ability of an item to differentiate among students on the basis of how well they know the material being tested. Various hand calculation procedures have traditionally been used to compare item responses to total test scores using high and low scoring groups of students.
6.4.2 ITEM DIFFICULTLY
For items with one correct alternative worth a single point, the item difficulty is simply the percentage of students who answer an item correctly. ... It also plays an important role in the ability of an item to discriminate between students who know the tested material and those who do not.
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