| 
 | 下限 | 上限 | 
| 区间 | 0.000 | 4.484 | 
| Slope | 0.697 | −0.927 | 
| T值 | 2.818 | −2.515 | 
| P > |t| | 0.003 | 0.007 | 
| 公式 | 
 | f(x) = x2 | 
| 极值 | 
 | 2.079 | 
| T值 | 
 | 2.520 | 
| P | 
 | 0.007 |