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In: Statistics and Probability

1.6) Mention the business implications of performing ANOVA for this particular case study. A B Volunteer...

1.6) Mention the business implications of performing ANOVA for this particular case study.

A B Volunteer Relief
1 1 1 2.4
1 1 2 2.7
1 1 3 2.3
1 1 4 2.5
1 2 1 4.6
1 2 2 4.2
1 2 3 4.9
1 2 4 4.7
1 3 1 4.8
1 3 2 4.5
1 3 3 4.4
1 3 4 4.6
2 1 1 5.8
2 1 2 5.2
2 1 3 5.5
2 1 4 5.3
2 2 1 8.9
2 2 2 9.1
2 2 3 8.7
2 2 4 9
2 3 1 9.1
2 3 2 9.3
2 3 3 8.7
2 3 4 9.4
3 1 1 6.1
3 1 2 5.7
3 1 3 5.9
3 1 4 6.2
3 2 1 9.9
3 2 2 10.5
3 2 3 10.6
3 2 4 10.1
3 3 1 13.5
3 3 2 13
3 3 3 13.3
3 3 4 13.2

Solutions

Expert Solution

1.6)

Perform in Minitab software:

Factorial Fit: Relief versus A, B, Volunteer

Estimated Effects and Coefficients for Relief:

Term Effect Coef SE Coef t P
Constant 7.18333 0.1477 48.63 0.000
A 5.95000 2.97500 0.1809 16.44 0.000
B 4.35000 2.17500 0.1809 12.02 0.000
Volunteer -0.00667 -0.00333 0.1982 -0.02 0.987
A*B 2.58750 1.29375 0.2216 5.84 0.000
A*Volunteer 0.02000 0.01000 0.2427 0.04 0.967
B*Volunteer -0.01000 -0.00500 0.2427 -0.02 0.984
A*B*Volunteer -0.03750 -0.011875 0.2973 -0.06 0.950

S = 0.886292; PRESS = 34.4507; R-Sq = 94.13%; R-Sq(pred) = 90.81%; R-Sq(adj) = 92.66%

Analysis of Variance for Relief:

Source DF Seq SS Adj SS Adj MS F P
Main Effects 3 325.950 325.950 108.650 138.32 0.000
A 1 212.415 212.415 212.415 270.42 0.000
B 1 113.535 113.535 113.535 144.54 0.000
Volunteer 1 0.000 0.000 0.000 0.000 0.987
2-Way Interactions 3 26.782 26.782 8.927 11.37 0.000
A*B 1 26.781 26.781 26.781 34.09 0.000
A*Volenteer 1 0.001 0.001 0.001 0.00 0.967
B*Volenteer 1 0.000 0.000 0.000 0.00 0.984
3-Way Interactions 1 0.003 0.003 0.003 0.00 0.950
A*B*Volunteer 1 0.003 0.003 0.003 0.00 0.950
Residual Error 28 21.994 21.994 0.786
Total 35 374.730

Unusual Observations for Relief:

Obs StdOrder Relief Fit SE Fit Residual St Resid
17 17 8.9 7.1867 0.2472 1.7133 2.01R
18 18 9.1 7.1844 0.1618 1.9156 2.20R
20 20 9.0 7.1800 0.2472 1.8200 2.14R

R denotes an observation with a large standardized residual.

Estimated Coefficients for Relief using data in uncoded units

Term Coef
Constant 2.20556
A 0.30833
B -0.46667
Volunteer -0.058889
A*B 1.32500
A*Volunteer 0.031667
B*Volunteer 0.021667
A*B*Volunteer -0.012500

Residual Plots for Relief:


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