Question: Which statement is TRUE regarding an item - discrimination index? Group of answer choices There is more than one formula for calculating an item -

Which statement is TRUE regarding an item-discrimination index?
Group of answer choices
There is more than one formula for calculating an item-discrimination index.
Tetrachoric correlation is most frequently used in any formula for an item-discrimination index.
It has been used by e-Harmony.com and other dating sites for matchmaking.
All of these.

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