Question

Q1. If all observations are within control limits, does that guarantee that the process is random? Discuss.

Q2. Suppose that a customer has recently tightened the specs for a part of your company supplies. The specs are now much tighter than the machine being used for the job is capable of. Briefly discuss the alternatives you might consider to resolve this problem.

Q3. How important is it for managers to maintain and promote ethical behavior in dealing with quality issues? Does your opinion depend on the product or service involved?

Q4. Who needs to be involved in setting quality standards?

Answer 1

1. No, even when all observations are within control limits, it doesn't guarantee that the process is random. All the observations can be within control limits but there can be some non-random patterns developing in the data which will indicate an out of control process. These non-random patterns developing in the data will suggest that process is not random & therefore, will not be in control for long. When we check for points within control limits, we get to know about only the extreme values that fall outside the limits but it fails to reveal the non-random patterns. Different sort of patterns developing in the data such as patterns like cycles, trends, etc. leads to non-random process. When we use control charts, it tests for points that are too extreme to be considered random. Therefore, even when all the points are within control limits, it does not guarantee that the process is random.