问题如下:
6.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 two in this case (the intercept and the slope coefficient). The number of degrees of freedom is 50− 2 = 48.
error的df是n-2,regression的df是k,这题考的是error的吗?