Question: Four factors (A, B, C, and D), each at three levels, are controlled in an experiment using an L9 orthogonal array. The output quality is

Four factors (A, B, C, and D), each at three levels, are controlled in an experiment using an L9 orthogonal array. The output quality is classified as acceptable or unacceptable; unacceptable includes both the second class and reject classes. Consider the data shown in Table 12-47. Combine the second-class and reject categories into one class and label it as unacceptable, and accumulate the data accordingly. From the accumulation analysis, determine the optimal settings of the design factors.

Factor Quality of Fabric Experiment ABC D Acceptable Second Class Reject 2 32

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