Concept explainers
a.
Fit the linear regression model using the method of least squares relating BOD to the time.
Find the estimate of
b.
Estimate the expected BOD level when the time is 15 days.
c.
Find the expected mean change in BOD when the time changes by three days.
d.
Find the fitted value of y corresponding to six days.
Find the corresponding residual.
e.
Find the fitted
Construct the graph of
Comment on the shape of the diagram if the linear relationship between shear strength and age were perfectly deterministic.
Explain whether the diagram actually obtained indicates that age is reasonable choice of regressor variable in this model.
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Applied Statistics and Probability for Engineers
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