Name:
Class:
Date:
Indicate whether the statement is true or false.
1. The two basic types of control charts are control charts for factors and control charts for treatments.
a.
True
b.
False
2. “Tampering” can actually make a system worse.
a.
True
b.
False
3. Common cause variation is the inherent variation in an in-control process.
a.
True
b.
False
4. The chart charts the averages of small subsamples through time.
a.
True
b.
False
5. A p chart plots the proportions of items that are conforming.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. The control limits for an R chart are set:
a.
one mean distance from the average
b.
at -1 and +1
c.
three standard deviations from the average
d.
at 0 and +1
7. 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:
a.
a type II error
b.
both a type I and type II error
c.
a type I error
d.
neither a type I nor a type II error
8. 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.
Have Constancy of Purpose.
b.
Embrace the New Philosophy.
c.
Institute Leadership of People.
Name:
Class:
Date:
d.
Break Down Barriers.
9. Out-of control indicators may include a number of conditions. What is not one of these?
a.
At least 8 upward (or downward) consecutive changes
b.
At least 8 consecutive points above (or below) the centerline
c.
At least 1 point beyond two standard deviations from the centerline
d.
At least 4 of 5 consecutive points beyond one standard deviation from the centerline
10. Michael has incorporated a vigorous cross-training program within his department. This is an example of which of
Deming’s 14 points?
a.
Improve Every Process.
b.
Institute Training.
c.
Drive Out Fear.
d.
Encourage Education.
11. 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):
a.
type II error
b.
average run length error
c.
type I error
d.
type I and type II error
12. The average run length (ARL) indicates the mean length of time between:
a.
false alarms in an in–control process
b.
false alarms in an out-of-control process
c.
out-of-control indications in an out-of—control process
d.
type II errors in an in-control process
13. 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 ____.
a.
assignable causes
b.
in statistical control causes
c.
common causes
d.
in control causes
14. Which of the following are attributes charts?
a.
p chart, chart, and u chart
b.
p chart, chart, and u chart
c.
p chart, c chart, and u chart
d.
p chart, c chart, and R chart
15. Which of the following is not one of Deming’s 14 Points?
a.
Use Lowest-Tender Contracts.
b.
Have Constancy of Purpose.
Name:
Class:
Date:
c.
Institute Leadership of People.
d.
Break Down Barriers.
16. 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?
17. Morgan decided 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?
18. 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.
19. 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?
20. 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?
Name:
Class:
Date: