A product has three quality characteristics. The nominal values of these quality characteristics and their sample covariance matrix have been determined from the analysis of 30 preliminary samples of sizen=10 as follows:
The sample means for each quality characteristic for 15 additional samples of sizen=10 are shown in Table 11E.2. Is the process in statistical control?
TABLE 1 1 E .2
Data for Exercise 11.2
Sample Number
1
3.1
3.7
3.0
2
3.3
3.9
3
2.6
2.4
4
2.8
2.5
5
6
4.0
4.6
3.5
7
3.8
4.2
8
2.7
9
2.2
10
2.0
1.8
11
3.2
12
13
4.1
4.7
14
2.9
15
3.6
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