Question: Quality Style manufactures self-assembling furniture. To reduce the cost of returned orders, the manager of its quality control department inspects the final packages each day

Quality Style manufactures self-assembling furniture. To reduce the cost of returned orders, the manager of its quality control department inspects the final packages each day using randomly selected samples. The defects include wrong parts, missing connection parts, parts with apparent painting problems, and parts with rough surfaces. The average defect rate is three per day.

(a) Which type of control chart should be used? Construct a control chart with 3-sigma control limits.

(b) Today the manager discovered nine defects. What does this mean?

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