Deck 20: Statistical Process Control

Question 1

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

A) Use Lowest-Tender Contracts.
B) Have Constancy of Purpose.
C) Institute Leadership of People.
D) Break Down Barriers.

Answer 1

A

Question 2

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

Answer 2

C

Question 3

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

Answer 3

A

Question 4

The $\bar { X }$ chart charts the averages of small subsamples through time.

Question 5

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

Question 6

Which of the following are attributes charts?

A) p chart,
$x$ chart,and u chart
B) p chart,
$X$ chart,and u chart
C) p chart,c chart,and u chart
D) p chart,c chart,and R chart

Question 7

The control limits for an R chart are set:

A) one mean distance from the average
$R$
B) at -1 and +1
C) three standard deviations from the average
$R$
D) at 0 and +1

Question 8

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

Question 9

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?

Question 10

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

Question 11

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.

Question 12

"Tampering" can actually make a system worse.

Question 13

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

Question 14

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

Question 15

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

Question 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 11 consecutive points above the centerline and three points beyond two standard deviations from the centerline.How should Taveen react?

Question 17

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.
D) Break Down Barriers.

Question 18

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?

Question 19

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?