| 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
N | 有效 | 717 | 717 | 717 | 717 | 717 | 717 | 717 | 717 | 717 | 717 | 717 |
缺失 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
均值 | 3.37 | 3.33 | 3.24 | 3.25 | 3.30 | 3.27 | 3.32 | 3.37 | 3.26 | 3.30 | 3.03 | |
众数 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 3 | 4 | 3 | |
标准差 | 0.993 | 0.969 | 0.902 | 0.972 | 1.096 | 0.963 | 0.929 | 1.116 | 1.777 | 1.041 | 0.930 | |
方差 | 0.99 | 0.94 | 0.81 | 0.94 | 1.20 | 0.93 | 0.86 | 1.25 | 3.16 | 1.08 | 0.86 |