Research Article
An Online Teaching Video Evaluation Scheme Based on EEG Signals and Machine Learning
Table 3
The difficulty values of algebraic problems.
| Type of question | Difficulty value | Type of question | Difficulty value |
| 2-digit ± 2-digit | 2 | 2-digit × 2-digit | 8 | 3-digit ± 3-digit | 3 | 3-digit × 3-digit | 21 | 4-digit ± 4-digit | 4 | | |
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