NO.PZ202109130200004306
问题如下：
Based on Exhibit 2, the degrees of freedom for the t-test of the slope coefficient in this regression are:
选项：
A.48 B.49 C.50解释：
A is correct. The degrees of freedom are the number of observations minus the number of parameters estimated, which equals 2 in this case (the intercept and the slope coefficient). The number of degrees of freedom is 50-2=48.
这道题的自变量不就一个x，debt ratio么？因为是n-1才对，为什么是n-2 ？
