places if needed. A high school principal wanted to know if there was a difference in absences for 9th grade, 10th grade, 11th grade, or 12th grade among students with less than a 2.0 GPA. She took a random sample of n = 5 students from each grade and compared absences among the four grades using ANOVA. The data are below

calculate the sum tukey hsd using a= .05

calculate the mean square between group

calculate the mean square within group

9th grade 10th grade |11th grade 12th grade 10 17 15 9 12 16 a 11 11 12 11 14 12 J 14 15 12