Exam 20: Statistical Process Control

Michael has incorporated a vigorous cross-training program within his department. This is an example of which of Deming's 14 points?

Which of the following are attributes charts?

Out-of control indicators may include a number of conditions. What is not one of these?

Common cause variation is the inherent variation in an in-control process.

Morgan has calculated the upper and lower limit for control limits in an chart, and determines the out-of-control behavior she observed might be due to the fact that she was using an extremely small sample. Therefore, she quadruples her sample size, and the sample is now much larger than even her original sample. Unfortunately, she forgets to adjust the upper and lower limits again to reflect the much larger sample size. What is likely to occur as she manually plots observations on the chart?

Taveen, the production manager at Wire Express, has noticed that one of his machines seems to stall out briefly toward the end of a run. He is wondering whether this stalling is affecting the width of the wire product. He creates several control charts and notices about 11 consecutive points above the centerline and three points beyond two standard deviations from the centerline. How should Taveen react?

Jean is examining variation on a control chart. One of the machines was misaligned and is operated by an inexperienced worker. The variation caused by these factors is caused by ____.

The control limits for an R chart are set at:

The chart charts the averages of small subsamples through time.

Mohammed is monitoring the diameter of bolts that are being produced on one of his assigned production lines. During this process, he notices nine, consecutive measurements that jumped above the upper control limit. He immediately examines the machine, finds it to be misaligned, and makes a small adjustment. Mohammed has likely committed:

Jada has decided to implement weekly meetings between departments to discuss issues that occur cross-department. She also has implemented a worker morale program aimed at building teamwork. These are both events that even the most upper management will attend. Which of Deming's 14 Points is Jada addressing?

A p chart plots the proportions of items that are conforming.

The two basic types of control charts are control charts for factors and control charts for treatments.

Which of the following is not one of Deming's 14 Points?

Taveen, the production manager at Wire Express, has noticed that one of his machines seems to stall out briefly toward the end of a run. He is wondering whether this stalling is affecting the width of the wire product. He creates several control charts and notices about four consecutive points above the centerline and one point beyond two standard deviations from the centerline. How should Taveen react?

Morgan has calculated the upper and lower limit for control limits in an chart. She doesn't have the software available to create these charts automatically, so she determines what happens to these limits if n decreases. Suppose Morgan is now using a smaller sample size, but she has forgotten to adjust the upper and lower limits to reflect the smaller sample size. What is likely to occur as she manually plots observations on the chart?

"Tampering" can actually make a system worse.

The average run length (ARL) indicates the mean length of time between:

Morgan has calculated the upper and lower limit for control limits in an chart. She doesn't have the software available to create these charts automatically, so she is wondering what happens to these limits if n decreases. Explain what happens to the limits and why.

Mohammed is monitoring the diameter of bolts being produced on one of his assigned production lines. During this process, he notices one, single measurement that jumped above the upper control limit. He immediately adjusts the alignment on several machines to address the problem. Mohammed has likely committed a(n):