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

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Basic Math

To test whether students in a higher grade level will be lessdisruptive in class, a school psychologist records the number ofdocumented interruptions during one day of classes from nine localhigh schools. The sample consisted of nine

(n = 9)

freshman, sophomore, junior, and senior high school classes. Thedata 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 twodecimal 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. (Assumealpha equal to 0.05.)

Yes, post hoc analyses are appropriate because the ANOVA issignificant.

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



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

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