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.

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