A high school principal wanted to know if there was a difference in absences for 9th grade, 10th grade, 11th grade, and 12th grade among students with less than a 2.0 GPA. She took a random sample of n=5 students from each grade level and compared absences among the four grades using ANOVA.  9th grade                   10th grade                  11th grade                12th grade 6                                         10                               17                                  15 9                                         12                               8                                     16 6                                         11                               11                                   12 7                                         11                               14                                   12 7                                         14                               15                                   12   Calculate the sum of squares within groups

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