A mail-order business selling personal computer supplies, software and hardware maintains a centralized warehouse. Management is currently examining the process of distribution from the warehouse and...

A mail-order business selling personal computer supplies, software and hardware maintains a centralized warehouse. Management is currently examining the process of distribution from the warehouse and wants to study the factors that affect the warehouse distribution costs.

Data collected over 24 random months contain the warehouse’s distribution cost (in thousands of Rands), the sales (in thousands of Rands) and the number of orders received. A multiple linear regression model was fitted to the data by using Stat1.2. Use the output to answer the questions that followby typing only the letter of the correct option in the answer boxes.

Variables

y: Warehouse Distribution Cost
x1: Sales
x2: Number of Orders

Model Fitting Statistics

R² = 0.8504
Adj R²: ?

Regression Coefficients

             Beta Parameter        Standard         b Parameter    Standard
                 Estimates           Error of Beta        Estimates      Error of b      t Statistic         Prob > |t|


 Intcpt                                                                 -0.800             7.325              -0.109                 0.914

 x1              0.144                     0.150                  0.023              0.024               0.961                 0.348

 x2            0.791                     0.150                  0.018              0.003              5.266                 0.001*

Contribution of the variables to R^2
Predictor          R_i
²              R² - R_i
²               f²
 x1                 0.8221             0.0075             0.0439
 x2                 0.6045             0.2251             1.3206

The estimated multiple regression line is given by?