对回归模型<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251123/22555442_0.png">进行检验时，通常假定<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251123/22555442_0_1.png">服从（）。