=+where the outer diameter of each casting (in mm) was recorded. The target diameter of each casting was 60 mm. The corresponding data is given here:

Batch x1 x2 1 59.664 59.675 2 59.661 59.648 3 59.679 59.652 4 59.665 59.654 5 59.667 59.678 6 59.673 59.657 7 59.676 59.661 8 59.648 59.651 Batch x1 x2 9 59.681 59.675 10 59.655 59.672 11 59.691 59.676 12 59.682 59.651 13 59.651 59.682 14 59.668 59.685 15 59.691 59.682 16 59.661 59.673