Question

Chapter 12 WebAssign

An educator wants to evaluate four different methods aimed at reducing the time children spend "off task" in the classroom. To test these methods, she implements one method in each of four similar classrooms and records the time spent off task (in minutes) in each classroom. The results are given in the table.

Classroom Method
A	B	C	D
2	0	0	0
1	5	3	5
3	0	3	4
1	3	4	3
4	1	6	4
4	1	6	2
0	4	5	2
5	5	4	2
2	2	0	4

(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.  

Answer 1

Data Summary
Groups	N	Mean	Std. Dev.	Std. Error
Group 1	9	2.4444	1.6667	0.5556
Group 2	9	2.3333	2	0.6667
Group 3	9	3.4444	2.2423	0.7474
Group 4	9	2.8889	1.5366	0.5122

ANOVA Summary
Source	Degrees of Freedom DF	Sum of Squares SS	Mean Square MS	F-Stat	P-Value
Between Groups	3	6.89	2.30	0.65	0.5898
Within Groups	32	113.34	3.54
Total:	35	120.22

B) since level of significance = 0.05

P value = 0.5898

Since p value greater than level of significance so there sifficient evidence to conclude that there is not significant difference between mean

So answer

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