Aregression model involved 5 independent variables and 126 observations. the critical value of t for testing the significance of each of the independent variable's coefficients will have

The critical value of t for testing the significance of each of the independent variable's coefficients will have 125 degrees of freedom.

Step-by-step explanation:

Here we have to find the degrees of freedom for the t testing, which is calculated with:

; where refers to the total number of observations.

So, in this case would be:

The degrees of freedom refers to the range where observations can variate. It's like you have to choose one object between other 5, when you are gonna pick the first one, you have 5 choices, the process can variate 5 items, then when you are gonna pick the second one, you have 4 choices, that your range of variation, when you are gonna pick the fifth one, you don't have decision to make, there you don't "freedom" to choose, that's an analogy of the degrees of freedom.

step-by-step explanation:

boxplot e is the answer