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: 9th grade 10th grade 11th grade 12th grade 10 17 15 9. 12 8 16 11 11 12 11 14 12 14 15 12 2. Calculate the Tukey HSD (using a = .05) 3. Which of the following is the appropriate statistical conclusion? 6 677

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