Quality Control
Charts: u Chart
Suppose that you are monitoring the amount of flaws on the paint job of SUVs that come off of one of GMs production lines.
Enter Data:
In
C1, enter the number of flaws found on the line. In C2, enter the number of
SUVs that were sampled.
|
Defective |
Number Sampled |
|
1 |
1 |
|
3 |
1 |
|
0 |
1 |
|
1 |
1 |
|
1 |
1 |
|
0 |
1 |
|
2 |
1 |
|
1 |
1 |
|
3 |
1 |
|
3 |
1 |
|
2 |
2 |
|
2 |
2 |
|
2 |
2 |
|
1 |
2 |
|
2 |
2 |
|
1 |
2 |
|
2 |
2 |
|
3 |
2 |
|
1 |
2 |
|
0 |
2 |
u
Chart:
- To
do a quality control chart for proportion, go to Stat, Control Charts, Attributes Charts,
u Chart.
- You should get the
following screen.
- Enter the number of
flaws, C1, into the box for Variable.
- Enter C2 for Subgroup
size.
- Then click o.k. The
chart below should appear.
