Quality Style manufactures self-assembling furniture. To reduce the cost of returned orders, the manager of its quality

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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 four 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 11 defects. What does this mean?

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