Control Charts 3

Question 1

What are the two uses for control charts?

Answer 1

1 Monitoring and Surveilance tool

2 Retrospective process analysis tool

Question 2

What are the two main purposes of analysis of processes through control charts?

Answer 2

1 To estimate the real and the potential capability of processes
2 To reduce the process’s variability.

Question 3

What are the four steps of implementing CC of the first stage;

Answer 3

Process Analysis
Characterization of variation
Process improvement
Fixing the definitive control limits

Question 4

What are the four steps of implementing CC of the second stage;

Answer 4

Control- and process monitoring

Periodic re-estimation of the control limits.

Question 5

What do the control limits represent?

Answer 5

The expected variation through common causes

Question 6

What rule to follow in order to convert from Binomial to Poisson Distribution:

Answer 6

N > 20 and NP < 8
Binomial (N, p) –> Poisson (l)
l = N*p

Question 7

How to compute Natural Tolerance Limits of a process?

Answer 7

NTL = mü+- 3 sigma

Question 8

How to standardize for using the normal distribution tables?

Answer 8

Z= (x-mü)/sigma
x gesuchter parameter
mü = CL

Question 9

What not to forget when standardizing with subgroups?

Answer 9

Squareroot of the n