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
5	0	4	1
4	3	3	2
2	0	6	2
0	2	5	4
3	1	0	4
1	5	3	4
3	1	5	5
1	4	0	3
5	4	5	2

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

of Variation	SS	df	MS	F
Between groups
Within groups (error)
Total

Answer 1

Here we are calculate by Excel:

Anova: Single Factor
SUMMARY
Groups	Count	Sum	Average	Variance
Column 1	9	24	2.666667	3.25
Column 2	9	20	2.222222	3.444444
Column 3	9	31	3.444444	4.777778
Column 4	9	27	3	1.75
ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	7.22	3	2.41	0.73	0.5427	2.901
Within Groups	105.78	32	3.31
Total	113	35