Item Analysis Flashcards
An item analysis is conducted to determine which items to retain in the final version of a test. An item’s___refers to the extent to which items contribute to the goals of testing.
relevance
An item difficulty level(p) is calculated by dividing the number of examinees who answered the item correctly by the____.
Total number of examinees
In general, an item difficulty level of___is preferred because it not only maximizes___between examinees of low and high ability but also helps ensure that the test has high____.
.05; discrimination; reliability
The optimal difficulty level is affected by the probability that an examinee can answer the item correctly by guessing. For this reason, the optimal p value for true/false items is___.
.75
Advantages of item response theory(IRT) are that item parameters are____invariant and performance on different sets of items or tests can be easily_____. Use of IRT involves deriving an item__for each item.
sample;equated; chacteristic curve
