Key Concept
Statistical process control (SPC)
The table below gives readings from a process from which 10 samples were taken with each sample having a sample size of three items. In this week’s Key Concept Activity, you will draw a mean and range chart for the data presented in the table below and determine whether the process is in control or not. The second table is a table of constants that will help you in drawing the chart.
To prepare for this Key Concept Exercise:
- Review and evaluate the sample chart provided.
- Read the Required Learning Resources for Week 4.
Table 1: Readings from a production process.
|
|
Readings |
||
|
1 |
43 |
41 |
47 |
|
2 |
37 |
39 |
29 |
|
3 |
27 |
45 |
41 |
|
4 |
51 |
31 |
39 |
|
5 |
35 |
35 |
33 |
|
6 |
45 |
33 |
33 |
|
7 |
31 |
35 |
35 |
|
8 |
27 |
41 |
39 |
|
9 |
37 |
31 |
41 |
|
10 |
41 |
47 |
43 |
Table 2: Table of constants.
|
|
RANGE |
||||
|
UPPER |
LOWER |
||||
|
N |
dn |
Action |
Warning |
Action |
Warning |
|
2 |
1.128 |
4.12 |
2.81 |
0.00 |
0.04 |
|
3 |
1.693 |
2.98 |
2.17 |
0.04 |
0.18 |
|
4 |
2.059 |
2.57 |
1.93 |
0.10 |
0.29 |
To complete this Key Concept Exercise:
- Draw a mean and range chart for the data presented in Table 1. Table 2 represents constants that will help you in drawing the chart. Prepare a report based on the analysis of your chart to determine whether the chart is either in control or out of control, and state your reasons why. In addition, explain how SPC charts could be utilised in your organisation or an organisation with which you are familiar (500 words).
- By Day 3, submit your Key Concept Exercise.
- Be sure to read over your Key Concept Exercise before submitting it to your Instructor. Make sure the spelling and grammar are correct and the language, citing and referencing you use when providing your opinion are appropriate for academic writing.
Note: Do not post your chart and answers to the Collaboration Forum.
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Rating:
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Solution: Week 4 Key Concept Exercise
Solution: Key Concept.