In: Operations Management
Y^ = b0 + b1X1
The following table shows the calculations for regression line:
The following table shows the calculations for regression line:
| 
 Customers (in 1000s), X  | 
 Line Maintenance Expense (in $1000s), Y  | 
 X^2  | 
 Y^2  | 
 XY  | 
|
| 
 25.3  | 
 484.6  | 
 640.09  | 
 234837.16  | 
 12260.38  | 
|
| 
 36.4  | 
 672.3  | 
 1324.96  | 
 451987.29  | 
 24471.72  | 
|
| 
 37.9  | 
 839.4  | 
 1436.41  | 
 704592.36  | 
 31813.26  | 
|
| 
 45.9  | 
 694.9  | 
 2106.81  | 
 482886.01  | 
 31895.91  | 
|
| 
 53.4  | 
 836.4  | 
 2851.56  | 
 699564.96  | 
 44663.76  | 
|
| 
 66.8  | 
 681.9  | 
 4462.24  | 
 464987.61  | 
 45550.92  | 
|
| 
 78.4  | 
 1037  | 
 6146.56  | 
 1075369  | 
 81300.8  | 
|
| 
 82.6  | 
 1095.6  | 
 6822.76  | 
 1200339.36  | 
 90496.56  | 
|
| 
 93.8  | 
 1563.1  | 
 8798.44  | 
 2443281.61  | 
 146618.78  | 
|
| 
 97.5  | 
 1377.9  | 
 9506.25  | 
 1898608.41  | 
 134345.25  | 
|
| 
 105.7  | 
 1711.7  | 
 11172.49  | 
 2929916.89  | 
 180926.69  | 
|
| 
 124.3  | 
 2138.6  | 
 15450.49  | 
 4573609.96  | 
 265827.98  | 
|
| 
 Total  | 
 848  | 
 13133.4  | 
 70719.06  | 
 17159980.62  | 
 1090172.01  | 
Sample size: n = 12
Question. According to equation Y^ = b0 + b1X1 what level of line maintenance expense would be expected for a phone company with 75,000 customers show how you arrive at this value.