In Multiple Regression Analysis with N Observations and K Predictors $\beta _ { i }$

Multiple Choice

In multiple regression analysis with n observations and k predictors (or equivalently k+1 parameters) , inferences concerning a single parameter $\beta _ { i }$ are based on the standardized variable , which has a t-distribution with degrees of freedom equal to

A) n-k+1
B) n-k
C) n-k-1
D) n+k-1
E) n+k+1