If 20 of 40 in the upper group and 20 of 40 in the lower group choose the correct answer to a multiple-choice question w

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answerhappygod
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If 20 of 40 in the upper group and 20 of 40 in the lower group choose the correct answer to a multiple-choice question w

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If 20 of 40 in the upper group and 20 of 40 in the lower group
choose the correct answer to a multiple-choice question with five
possible responses, what would the index of discrimination be for
the item?
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