CONTROL PHASE

Question 1

TYPE of Statistical Process Control for these charts:
X-BAR chart
X-S chart
I-MR Chart
P-CHART
np-Chart
u- chart
c- chart

Answer 1

shewhart charts

Question 2

TYPE of Statistical Process Control for these charts:
EWMA Chart
CUSUM Chart
Control Methods

Answer 2

Time-weighted control charts

Question 3

determines whether the process variation is consistent or unpredictable

Answer 3

CONTROL CHARTS

Question 4

T/F

A process is considered in statistical control when only common causes are present

Answer 4

TRUE; process variation is controlled, the process becomes predictable

Question 5

Misinterpretation can lead to the following:

Answer 5

Under-reacting ( missed prevention) & Tampering (increases variation)

Question 6

when to use X BAR Charts-

Answer 6

most common, applied to higher volume of data or service; inappropriate for range

Question 7

when to use R charts

Answer 7

most common; used to plot values of the range to control a variables variability. subgroup size < 8

Question 8

when to use S charts

Answer 8

most common; used to plot values of standard deviation to control a variables variability subgroup size > 8

Question 9

When to use I Charts

Answer 9

used to plot individual values to control a variables variability

Question 10

when to use MR Moving Range

Answer 10

low volume of data, long cycle time to build product or serve customer,

Question 11

types of charts for continuous data

Answer 11

X BAR, R, S, I, MR

Question 12

Defective Charts are

Answer 12

P & NP used to plot the % of defectives and complete control limits based on binomial distribution

Question 13

Defect Charts are

Answer 13

c & u used to plot the number of defects per unit and compute control limits on the basis of Poisson distribution

Question 14

minitab for I-MR charts

Answer 14

Stat>Control Charts> Variables Charts for individuals> I-M

Question 15

minitab for P-charts

Answer 15

Stat>Control Charts>Attributes Charts> P

Question 16

minitab for U-Charts

Answer 16

Stat>Control Charts> Attributes Charts> U

Question 17

T/F
Time-weighted control charts are more sensitive to detecting small shifts in the shirt-run/low volume process mean than Shewhart Chart

Answer 17

True

Question 18

what type of control chart should be used first to study process instability?
Shewhart control
OR
Time weighted control charts

Answer 18

Shewhart

Question 19

Why do we need control plans?

Answer 19

sustainability
predictive information
good control plans

Question 20

____ actions are usually less successful

_____ actions will last longer

Answer 20

compensating & preventative

Question 21

P CHARTS

Answer 21

used to plot proportion of defective units

Question 22

NP CHARTS

Answer 22

used to plot the number of defectives units

Question 23

C CHARTS

Answer 23

used to plot the number of defects, sample is constant

Question 24

U CHARTS

Answer 24

used to plot the number of defects per unit; sample is variable

Question 25

What are some control methods?

Answer 25

Fully automated system, system shutdown, mistake-proofing

Question 26

what is the ideal state?

Answer 26

process is predictable and output meets customer expectations

Question 27

What is the threshold state?

Answer 27

process is predictable but output does not consistently meet customer requirements

Question 28

What is Brink of Chaos

Answer 28

process is not in statistical control but its output still meets customer expectations

Question 29

EWMA Charts are weight individual observations in geometrically _______ order

Answer 29

decreasing

Question 30

CUSUM is when historical information is as important as __________ data

Answer 30

present

Question 31

T/F
Components of an implementation plan:
work breakdown structure
influence strategy for priorities and resourcing
risk management plan
audit results for completion risks

Answer 31

TRUE

Question 32

5 ELEMENTS OF CONTROL PLAN

Answer 32

1. documentation
2. training
3. Monitoring - process charts, reports, SOPS
4. Response plan-FMEA