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. Complete the F-table. (Round your answers to two decimal places.) 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. You may need to use the appropriate table in Appendix B to answer this question. V

Explanation / Answer

please find ANOVA and table run on above data

b)as ANOVA is not significant cause p value is higher then 0.05 level.

hence post hoc analyses is not required

Anova: Single Factor SUMMARY Groups Count Sum Average Variance freshman 9 22 2.444444 2.777778 Sophomore 9 21 2.333333 3 Junior 9 30 3.333333 4.5 Senior 9 29 3.222222 1.194444 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 7.2222 3.0000 2.4074 0.8394 0.4824 2.9011 Within Groups 91.7778 32.0000 2.8681 Total 99 35

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