sing the following partial source table, what is the residual mean square value? A source table with lines for Regression, Residual, and Total. The sums of squares and degrees of freedom for the regression source are 53.5 and 1, respectively. The sums of squares and degrees of freedom for the residual source are 20.0 and 15, respectively. The remaining cells in the source table are blank. a. 1.333 b. 20.00 c. 53.50 d. 33.50