% Data for Example 18.8, vending machine

% delivery time (minutes)

y = [16.68 11.50 12.03 14.88 13.75 18.11 8.00 17.83 79.24 21.50, ...
      40.33 21.00 13.50 19.75 24.00 29.00 15.35 19.00 9.50 35.10, ...
      17.90 52.32 18.75 19.83 10.75]';

% number of refills (-)

x1 = [7 3 3 4 6 7 2 7 30 5 16 10 4 6 9 10 6 7 3 17 10 26 9 8 4]';

% distance (ft)

x2 = [560 220 340 80 150 330 110 210 1460 605, ...
      688 215 255 462 448 776 200 132 36 770 140 810 450 635 150]';