Consider the following pilot samples to construct the mean and range charts. The data below shows the size in CC. Construct the mean and range charts showing all control (action) –upper and lower limits, and warning upper and lower limits.
Consider the following pilot samples to construct the
|
Sample Number |
Item1 |
Item2 |
Item3 |
Item4 |
|
Sample 1 |
111.9 |
112.5 |
112.4 |
112.7 |
|
Sample 2 |
112.5 |
112.5 |
112.4 |
112.8 |
|
Sample 3 |
112.2 |
112.8 |
112.7 |
112 |
|
Sample 4 |
112.3 |
112.4 |
112.8 |
112.4 |
|
Sample 5 |
112.1 |
112.8 |
112.4 |
111.9 |
|
Sample 6 |
112.6 |
112.4 |
112.1 |
112.3 |
The following day, 6 samples were taken to check if the process under control or not. Theses samples are as follows:
|
Sample Number |
Item1 |
Item2 |
Item3 |
Item4 |
|
Sample 1 |
111.9 |
111.5 |
112.4 |
112.3 |
|
Sample 2 |
112.5 |
111.5 |
113.4 |
111.8 |
|
Sample 3 |
112.2 |
111.8 |
111.7 |
112 |
|
Sample 4 |
114.3 |
111.4 |
111.8 |
113.4 |
|
Sample 5 |
115.1 |
111.8 |
112.4 |
110.9 |
|
Sample 6 |
111.6 |
110.4 |
110.1 |
115.3 |
Is the process under control? Why? What actions should you take?
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