| A | B | C | D | And |
Sample size | 200 | 198 | 198 | 156 | 200 |
Get to the bottom of the grades | 4.11 (3.55 - 4.24) | 4.11 (3.54 - 4.30) | 3.41 (3.30 - 3.55) | 4.23 (4.06 - 5.02) | 4.08 (3.40 - 4.23) |
Measured results | 3.56 (3.43 - 4.09) | 4.00 (3.41 - 4.18) | 3.39 (3.28 - 3.50) | 4.03 (3.48 - 4.27) | 3.54 (3.38 - 4.10) |
With | −9.812 | −8.647 | −4.146 | −9.159 | −8.694 |
P | <0.05 | <0.05 | <0.05 | <0.05 | <0.05 |