Interpreting test statistics, p-values, and significance
Item Difficulty: p value: (Kehoe, as cited in McDonald, 2007) Percentage of correct responses Desired range on exam 0.3-0.8 (30% to 80% correct) Mean p value translates to mean % score on exam Very difficult items (less than 30% correct) or very easy items (more than 80% correct) contribute very little to the overall exam reliability ................
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