To test whether students in a higher grade level will be less disruptive in clas

Question

To test whether students in a higher grade level will be less disruptive in class, a school psychologist records the number of documented interruptions during one day of classes from nine local high schools. The sample consisted of nine

(n = 9)

freshman, sophomore, junior, and senior high school classes. The data for each high school class are given in the table.

(a) Complete the F-table. (Round your answers to two decimal places.)

(b) Is it necessary to compute a post hoc test? Explain. (Assume alpha equal to 0.05.)

Yes, post hoc analyses are appropriate because the ANOVA is significant. No, post hoc analyses are not appropriate because the ANOVA is not significant.    

High School Class Freshman Sophomore Junior Senior 2 4 0 2 0 3 4 5 3 5 0 4 4 1 4 3 1 0 5 2 1 0 5 4 5 5 3 4 5 1 6 2 2 2 5 3

Explanation / Answer

From the statistical software output, the ANOVA table will be:

ANOVA table

b) No, post hoc analyses are not appropriate because the ANOVA is not significant.

Source SS Df MS F-Stat Between Groups 8.75 3 2.92 0.88 Within Groups 106 32 3.31 Total 114.75 35

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