Assess students

# Example: Item analysis

Below is a sample item analysis that shows the summary table of statistics for all items (questions) for a multiple-choice classroom exam.   Review the item difficulty (P), discrimination (R(IT)), and distractors (options B-E).

Item analysis (sample of 10 items) – correct answer is “A”

Summary table of exam item statistics

<exam name >

N TOTAL  = 932 MEAN TOTAL = 69.4 S.D. TOTAL = 10.2   ALPHA = .84
ITEM P R(IT) NC MC MI OMIT A B C D E
1. 0.72 0.34 667 71.56 67.66 1 667 187 37 30 10
2. 0.90 0.21 840 70.11 69.02 1 840 1 76 9 5
3. 0.60 0.39 561 72.66 65.47 0 561 233 46 88 4
4. 0.99 -0.06 923 69.34 69.90 0 923 3 3 3 0
5. 0.94 0.14 876 69.76 68.23 0 876 0 12 24 20
6. 0.77 -0.01 716 69.34 69.57 0 716 16 25 35 140
7. 0.47 0.31 432 72.76 66.16 3 432 107 68 165 157
8. 0.12 0.08 114 71.61 68.39 8 114 218 264 153 175
9. 0.08 0.04 75 70.78 69.03 0 75 64 120 67 606
10. 0.35 0.42 330 75.24 63.54 0 330 98 74 183 247
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## Questions

1. Which item(s) could you remove altogether from the exam? Why?
2. Which distractor(s) would you revise?   Why?
3. Which items are working well?