Question

In: Statistics and Probability

Answer the one-way ANOVA questions using the data below. Use α = 0.05. 1 2 3...

Answer the one-way ANOVA questions using the data below. Use α = 0.05.

1 2 3 4
53
49
47
42
30
34
44
44
44
36
34
39
30
12
46
42
39
37
36
31
47
25
35
45
27
33
28
31


a) Compute the preliminary statistics below.
SSBG =  ;   dfBG =  
SSWG =  ;   dfWG =  
SST =   ; dfT =  

b) Compute the appropriate test statistic(s) to make a decision about H0.
critical value =   ; test statistic =  
Decision:  ---Select--- Reject H0 Fail to reject H0

c) Compute the corresponding effect size(s) and indicate magnitude(s).
η2 =   ;  ---Select--- na trivial effect small effect medium effect large effect  

d) Make an interpretation based on the results.

At least one mean is different from another.None of the means differed from one another.   


e) Conduct Tukey's Post Hoc Test for the following comparisons:
2 vs. 3: difference =   ; significant:  ---Select--- Yes No  
1 vs. 3: difference =   ; significant:  ---Select--- Yes No  

f) Conduct Scheffe's Post Hoc Test for the following comparisons:
2 vs. 4: test statistic =   ; significant:  ---Select--- Yes No  
1 vs. 4: test statistic =   ; significant:  ---Select--- Yes No  

Solutions

Expert Solution

a) Compute the preliminary statistics below.

Tests of Between-Subjects Effects
Dependent Variable:Res
Source Type III Sum of Squares df Mean Square F Sig.
Corrected Model 511.714a 3 170.571 2.562 .078
Intercept 38628.571 1 38628.571 580.258 .000
Factor 511.714 3 170.571 2.562 .078
Error 1597.714 24 66.571
Total 40738.000 28
Corrected Total 2109.429 27

SSBG = 511714 ;   dfBG = 3
SSWG = 1597714 ;   dfWG = 24
SST = 2109429 ; dfT = 27

b) Compute the appropriate test statistic(s) to make a decision about H0.
critical value = F(005, 3, 24)=3.0088 ; test statistic =  2.562
Decision: Fail to reject H0

c) Compute the corresponding effect size(s) and indicate magnitude(s).
η2 = 511.714/2109.429=0.2426 ;   small effect

d) Make an interpretation based on the results.

None of the means differed from one another.   

e) Conduct Tukey's Post Hoc Test for the following comparisons:

Multiple Comparisons
Dependent Variable:Res
(I) Factor (J) Factor Mean Difference (I-J) Std. Error Sig. 95% Confidence Interval
Lower Bound Upper Bound
Tukey HSD 1 2 8.5714 4.36124 .229 -3.4595 20.6024
3 3.0000 4.36124 .901 -9.0310 15.0310
4 10.7143 4.36124 .093 -1.3167 22.7452
2 1 -8.5714 4.36124 .229 -20.6024 3.4595
3 -5.5714 4.36124 .586 -17.6024 6.4595
4 2.1429 4.36124 .960 -9.8881 14.1738
3 1 -3.0000 4.36124 .901 -15.0310 9.0310
2 5.5714 4.36124 .586 -6.4595 17.6024
4 7.7143 4.36124 .312 -4.3167 19.7452
4 1 -10.7143 4.36124 .093 -22.7452 1.3167
2 -2.1429 4.36124 .960 -14.1738 9.8881
3 -7.7143 4.36124 .312 -19.7452 4.3167
Scheffe 1 2 8.5714 4.36124 .301 -4.5314 21.6743
3 3.0000 4.36124 .924 -10.1029 16.1029
4 10.7143 4.36124 .139 -2.3886 23.8171
2 1 -8.5714 4.36124 .301 -21.6743 4.5314
3 -5.5714 4.36124 .657 -18.6743 7.5314
4 2.1429 4.36124 .970 -10.9600 15.2457
3 1 -3.0000 4.36124 .924 -16.1029 10.1029
2 5.5714 4.36124 .657 -7.5314 18.6743
4 7.7143 4.36124 .392 -5.3886 20.8171
4 1 -10.7143 4.36124 .139 -23.8171 2.3886
2 -2.1429 4.36124 .970 -15.2457 10.9600
3 -7.7143 4.36124 .392 -20.8171 5.3886

2 vs. 3: difference =   ; significant: No  
1 vs. 3: difference =   ; significant: No  

f) Conduct Scheffe's Post Hoc Test for the following comparisons:
2 vs. 4: test statistic =   ; significant: No  
1 vs. 4: test statistic =   ; significant: No  


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