The table summarizes the results of a two-factor ANOVA for an experiment examining the effect of Instructional Method on Language Skill Score. Three levels of Instructional Method (IM: Vocabulary, Grammar, and SALT) were crossed with three levels of Aptitude (A: Low, Medium, and High). There were n=9 subjects in each separate sample (i.e. in each cell). To answer the next 5 questions, fill in all missing values in the table (Hint: Start with the df column). Source SS df MS F Between Cells 204 XXXXX XXXXX IM A 6 IM X A 24 Within Cells XXXXX Total 636 XXXXX XXXXX MS Within is [Choose ] [ Choose ] F for the Interaction is 6 F for Method is 72 36 MS Aptitude is 3 4 SS Aptitude is [ Gnovas ]