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For an MCQ, the proportion correct is 0.70 in the upper group and 0.55 in the lower group. Using D = p_u - p_l, what is the discrimination index?
ایک MCQ کے لیے، اوپری گروپ میں درست کا تناسب 0.70 اور نچلے گروپ میں 0.55 ہے۔ D = p_u - p_l کا استعمال کرتے ہوئے، امتیاز انڈیکس کیا ہے
  1. +0.15
  2. -0.15
  3. +0.85
  4. -0.85
Explanation

Subtracting the lower group proportion from the upper group proportion gives the discrimination index ($0.70 - 0.55 = +0.15$).


 Additional Information:

Item Discrimination (D): Measures how well an item differentiates between high-performing and low-performing student groups.

Positive Discrimination: Indicates that students who know the material overall answered correctly more often.

Updated on 30-10-2026 by Muqadas

Related MCQs

For an MCQ, the proportion correct is 0.70 in the upper group and 0.55 in the lower group. Using D = p_u - p_l, what is the discrimination index?
ایک MCQ کے لیے، اوپری گروپ میں درست کا تناسب 0.70 اور نچلے گروپ میں 0.55 ہے۔ D = p_u - p_l کا استعمال کرتے ہوئے، امتیاز انڈیکس کیا ہے
  1. +0.15
  2. -0.15
  3. +0.85
  4. -0.85
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