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P-value represents an item's difficulty as evaluated by dividing the total number of correct responses by the total number of students tested. P-value is calculated for true/false, multiple choice, gridded or hot spot-single response items. Item Mean is the average score for student responses to an open response question or to a multi-part question. Item Mean is calculated for inline response, matching, or hot spot-multiple selection items. Discrimination or Item Total Score Correlation is the correlation between the question score and the overall test score and indicates the extent to which success on an item corresponds to success on the test.
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