| C | D |
Sample size | 198 | 158 |
Get to the bottom of the grades | 8.05 (7.30 - 8.80) | 8.60 (7.78 - 9.30) |
Measured results | 7.80 (7.10 - 8.50) | 8.40 (7.60 - 8.90) |
With | −8.859 | −4.833 |
P | <0.05 | <0.05 |