Ten samples with five observations each have been taken from the Beautiful Shampoo Company plant in order to test for volume dispersion in the shampoo bottle-filling process. The average sample range was found to be 0.4 ounce. Develop control limits for the sample range.

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.

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

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

A computer manufacturer purchases microchips from a world-class supplier. The buyer has a lot tolerance proportion defective of 15 parts in 5000, with a consumer's risk of 15 percent. If the computer manufacturer decides to sample 2000 of the microchips received in each shipment, what acceptance number, c, would it want?