What is the rejection region for the test (at a=0.05)?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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  1. What is the rejection region for the test (at a=0.05)?
  2. concludes that the data provide sufficient evidence to indicate that the mean user maintenance cost does vary among the three state installations. Would we be able to know which two state installations vary? Briefly explain. 
  3. How can we find a 95% confidence interval for the difference between the mean cost in Texas and the mean cost in Kentucky? 
  4. If Texas was chosen as base level and a similar model was fit to the data, what would be the value of the estimated intercept? 
ex 5.5 one qualitative variable for BIDMAINT Data
The REG Procedure
Model: MODEL1
Dependent Variable: COST
Number of Observations Read
30
Number of Observations Used
30
Analysis of Variance
Sum of
Mean
Source
DF
Squares Square
F Value
Pr>F
Model
198772
99386
3.48
0.0452
Error
27
770671
28543
Corrected Total
29
969443
Root MSE
168.94782 R-Square
0.2050
Dependent Mean
372.43333
Adj R-Sq
0.1462
Coeff Var
45.36324
Parameter Estimates
Parameter
Standard
Variable
DF
Estimate
Error
t Value
Pr> It|
95% Confidence Limits
Intercept
1
279.60000
53.42599
5.23
<,0001
169.97892
389.22108
X1
1
80.30000
75.55576
1.06
0.2973
-74.72762
235.32762
X2
1
198.20000
75.55576
2.62
0.0141
43.17238
353.22762
Transcribed Image Text:ex 5.5 one qualitative variable for BIDMAINT Data The REG Procedure Model: MODEL1 Dependent Variable: COST Number of Observations Read 30 Number of Observations Used 30 Analysis of Variance Sum of Mean Source DF Squares Square F Value Pr>F Model 198772 99386 3.48 0.0452 Error 27 770671 28543 Corrected Total 29 969443 Root MSE 168.94782 R-Square 0.2050 Dependent Mean 372.43333 Adj R-Sq 0.1462 Coeff Var 45.36324 Parameter Estimates Parameter Standard Variable DF Estimate Error t Value Pr> It| 95% Confidence Limits Intercept 1 279.60000 53.42599 5.23 <,0001 169.97892 389.22108 X1 1 80.30000 75.55576 1.06 0.2973 -74.72762 235.32762 X2 1 198.20000 75.55576 2.62 0.0141 43.17238 353.22762
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