Abusiness school is preparing an informational booklet for entering graduate students. part of this material is a report on how various factors influence a student's gpa (grade point average). in particular, the school used a multiple regression model to study the relationship between y= graduate gpa and several independent variables x1, . if data from 166 current graduate students are used to develop the regression model, what are the degrees of freedom (df) for the regression sum of squares, the error sum of squares, and the total sum of squares? df for the regression sum of squares =df for the error sum of squares =df for the total sum of squares =