Question 4 (20 points) A rotating dryer manufacturer is interested in investigating the factors that affect pelletized material release performance. The study examined pelletized material release performance under all combinations of four coating thicknesses (T1, T2, T3, T4), three coating additives (A1, A2, A3) with three replications. The experimental units were randomly assigned to the various treatment combinations. (l) Is this a factorial design? Yes or No? If yes, please state the factorial design of this study. If no, please justify (5 marks). (ii ) Provide the skeleton ANOVA table (source and d.f. only) for the full model (including all the interaction components) (15 marks).