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:
6
9
7
10
12
11
14
17
8
15
16
9. Calculate the F statistic
10. Using the table in the back of the book, find the critical value for F (Fcrit) with α = .05
11. Calculate the Tukey HSD (using α = .05)
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