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Question

An item discrimination index (D) of ____ indicates that all examinees in the high-scoring group and none in the low-scoring group answered the item correctly.

  1. 1
  2. -1
  3. 0.5
  4. 0

The Correct Answer is A.

An item discrimination index of +1.0 indicates that all of the high-scoring and none of the low-scoring examinees answered the item correctly. The item discrimination index ranges from -1.0 to +1.0 and is calculated by subtracting the percent of low-scoring examinees who answered the item correctly (examinees who obtained low total scores on the test) from the percent of high-scoring examinees who answered the item correctly (examinees who obtained high total scores on the test).

Answer B: An item discrimination index of -1.0 indicates that all of the low-scoring and none of the high-scoring examinees answered the item correctly.

Answer C: An item discrimination index of .50 indicates that the 50% fewer of the examinees in the low-scoring group (versus the high-scoring group) answered the item correctly.

Answer D: An item discrimination index of 0 indicates that the same percent of examinees in the low- and high-scoring groups answered the item correctly.


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