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Table 6 Categorisation of problematic distractors by human expert

From: Automatic distractor generation for multiple-choice English vocabulary questions

  Baseline Proposed TOEFL
Too similar with the correct answer or the target word 26 3 1
Different word class 12 10 10
No relation to the correct answer 0 2 0
Different word difficulty 34 22 11
Antonym of the correct answer 3 0 1
Synonym pair 10 0 0
Others 0 3 2
Total problematic distractors 71 39 25