Three-dimensional (3D) printing is a manufacturing technology that allows the production of three-dimensional solid objects through a meticulous layering process performed by a 3D printer. 3D printing has rapidly become a time-saving and economical way to create a wide variety of products such as medical implants, furniture, tools, and even jewelry. The article "Process Capability Analysis of Cost Effective Rapid Casting Solution Based on Three Dimensional Printing" (MIT Intl. J. Mech. Engr., 2012: 31-38) considered the production process of metal castings by using a 3D printer. Data was collected on 16 batches (each having two castings), where the outer diameter of each casting (in mm) was recorded. The target diameter of each casting was 60 mm. The resulting data is given here:

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Batch 59.664 59.661 59.679 59.665 59.667 59.673 59.676 59.648 59.681 59.655 59.691 59.682 59.651 59.668 59.691 59.661 59.675 59.648 59.652 59.654 59.678 59.657 59.661 59.651 59.675 59.672 59.676 59.651 59.682 59.685 59.682 59.673 10 12 13 14 15 16