Multiple Choice
Which statement is TRUE regarding an item-discrimination index?
A) It has been used by e-Harmony.com and other dating sites for matchmaking.
B) There is more than one formula for calculating an item-discrimination index.
C) Tetrachoric correlation is most frequently used in any formula for an item-discrimination index.
D) All of these.
Correct Answer:

Verified
Correct Answer:
Verified
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