Short Answer
Exhibit 14-1
An express delivery service company recently conducted a study to investigate the relationship between the cost of shipping a package (Y),the package weight in pounds (X1),and the distance shipped in miles (X2).Twenty packages were randomly selected from among the large number received for shipment,and a detailed analysis of the shipping cost was conducted for each package.The sample information is shown in the table below: 
-Refer to Exhibit 14-1.Add the second explanatory variable (distance shipped)to the regression model.Estimate and interpret this expanded model.
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