NO.PZ202106160300004306
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.
为什么t检验的自由度为n-k-1？难道不是F(k，n-k-1)吗？
