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.
Answer to relevant QuestionsBox and Liu (1999) describe an experiment flying paper helicopters where the objective is to maximize flight time. They used the central composite design shown in Table 14E.9. Each run involved a single helicopter made to ...Consider the response model in equation 14.5. Suppose that in the response model we allow for a complete second-order model in the noise factors so that What effect does this have on the variance model? An accounting firm uses sampling methods in its client auditing processes. Accounts of a particular type are grouped together in a batch size of 25. The auditor is concerned about erroneous accounts escaping the auditing ...Reconsider the situation described in Exercise 15.1. Suppose that the batch of accounts contains two erroneous accounts. What is the probability that the random sample of size n = 5 that is selected contains at least one of ...Hospital personnel routinely examine patient records for error, such as incomplete insurance information, on incomplete patient history, or missing/incomplete medical records. On average, about 250 new patients are admitted ...
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