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Task difficulty
| Task | Intervals of difficulty index | Number of test tasks | Structure index | |
|---|---|---|---|---|
| A | B | |||
| Very difficult | [0–0.2) | – | – | – |
| Difficult | [0.2–0.4) | – | – | – |
| Average | [0.4–0.6) | 6 | 8 | 0.56 < 0.6740.50 H 0 accepted |
| Easy | [0.6–0.8) | 35 | 25 | 1.56 > 1.2820.20 H 0 rejected |
| Very easy | [0.8–1.0] | 55 | 63 | 1.19 > 1.0360.30 H 0 rejected |
| N | 96 | 96 | ||
