A computer manufacturer is considering sourcing supplies of an electrical component from one of four different manufacturers. The purchasing manager asks for 95 samples from each of the manufacturers. The numbers of acceptable and unacceptable components from each manufacturer are shown in the following table. Use a chi-square test to determine whether the quality of the component depends on the manufacturer. Let ? = 0.05. How does this help the manager to make decisions?

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Manufacturer Total Quality Unacceptable Acceptable 8 12 11 36 344 90 87 84 83 95 95 95 95 380 Total