线性回归方程的t检验是对每个自变量与因变量的相关关系的显著性检验。
参考答案：对
Peter__________be really difficult at times even though he's a nice person in general. [ ]
A. shall
B. should
C. can
D. must
社会学研究中怎样对一个概念进行操作化处理？
