| 代码 | 观测个数 | 均值 | 标准差 | 最小值 | 最大值 | 
| X1 | 285 | 1.625 | 0.485 | 1 | 2 | 
| X2 | 285 | 1.456 | 0.499 | 1 | 2 | 
| X3 | 285 | 1.491 | 0.794 | 1 | 5 | 
| X4 | 285 | 2.126 | 0.495 | 1 | 3 | 
| X5 | 285 | 1.737 | 0.441 | 1 | 2 | 
| X6 | 285 | 1.596 | 0.491 | 1 | 2 | 
| X7 | 285 | 1.705 | 0.487 | 1 | 3 | 
| X8 | 285 | 1.688 | 0.464 | 1 | 2 | 
| Y1 | 285 | 3.288 | 0.848 | 1 | 5 | 
| Y2 | 285 | 3.751 | 0.816 | 1 | 5 | 
| Y3 | 285 | 3.709 | 0.748 | 1 | 5 | 
| Y4 | 285 | 3.723 | 0.695 | 1 | 5 |