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In: Math

To test whether students in a higher grade level will be less disruptive in class, a...

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

1

0

3

4

2

5

6

1

4

1

0

3

0

4

4

2

1

1

5

4

3

0

0

4

5

2

3

2

2

5

5

4

4

3

4

5

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

Source of
Variation

SS

df

MS

F

Between
groups

Within
groups (error)

Total


(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.    



You may need to use the appropriate table in Appendix B to answer this question.

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