2. DF question : Assume that we have a dataset with n = 256 observations. For each scenario below, determine the error degrees of freedom. It may be helpful to write out each model. Type the numerical integer for each submission. Example is the value is 254 type 254 with no additional markings. (b) We create a model using 2 numerical explanatory variables and 1 categorical variable with 4 levels. Assume no interactions in this model