1. What types of operations exhibit the greatest natural variation in their output? How useful is statistical process control to these operations?
2. Suppose the range within a sample was calculated and then plotted on an R-chart, but this sample range fell outside the lower control limit on the R-chart. Does this necessarily represent defective production?
3. Why would a consumer tolerate a certain amount of defectiveness in a product? When is this more common?
4. A certain product can weigh no more than 1.001 and no less than 0.998 ounces by design. A machine being considered to produce this product has natural standard deviation of 0.0004 ounces in its output. What is the process capability index for this use of the machine?