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.

High School Class Freshman Sophomore Junior Senior 2 6 4 5 4 4 2 0 4 4 4 2 2 4 (a) Complete the F-table. (Round your answers to two decimal places.) Source of Variation Betweern groups Within groups (error) Total df MS (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.

Explanation / Answer

a) From the Statistical software output, the F - table will be:

ANOVA table

b) No, post Hoc analyses are not appropriate because the ANOVA is not significant. Option B is correct.

Source SS Df MS F-Stat Columns 10.31 3 3.44 1.00 Error 110.44 32 3.45 Total 120.75 35

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