A study of depression and exercise was conducted. A total of 4 groups were used: each group differs by the extent to which group members exercise. A depression rating (scale: 1-100, a continuous variable) was given to all 684 participants in the sample. An incompleted ANOVA table is provided below. What is the obtained F (i.e., value in Cell [8])? Sum of Squares df Mean Square F Between-Group [1] [2] [5] [8] Within-Group 157 [3] [6] [9] Total 204 [4] [7] [10]