Essay
(A)Estimate a simple linear regression model with Service Interval (X)and Maintenance Cost (Y).Interpret the slope coefficient of the least squares line as well as the computed value of 
.
(B)Do you think this model proves the agency's point about maintenance? Explain your answer.
(C)Obtain a residual plot vs.Service Interval.Does this affect your opinion of the validity of the model in (A)?
(D)Obtain a scatterplot of Maintenance Cost vs.Service Interval.Does this affect your opinion of the validity of the model in (A)?
(E)Use what you have learned about transformations to fit an alternative model to the one in (A).
(F)Interpret the model you developed in (E).Does it help you assess the agency's claim? What should the agency conclude about the relationship between service interval and maintenance costs?
Correct Answer:
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(A) 
(A)As the service interval increase...View Answer
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Correct Answer:
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(A)As the service interval increase...View Answer
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