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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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