Question: An article in Quality Progress For Starbucks It s in the

An article in Quality Progress (“For Starbucks, It’s in the Bag”, March 2011, pp. 18-23) describes using a central composite design to improve the packaging of one-pound coffee. The objective is to produce an airtight seal that is easy to open without damaging the top of the coffee bag. The experimenters studied three factors – x1 = plastic viscosity (300-400 centipoise), x2 = clamp pressure (170-190 psi), and x3 = plate gap (-3, +3 mm) – and two responses, y1 = tear and y2 = leakage. The design is shown in Table 14E.8.

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