Question: A product has three quality characteristics The nominal values of
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 size n = 10 as follows:
The sample means for each quality characteristic for 15 additional samples of size n= 10 are shown in Table 11E.2. Is the process in statistical control?
Construct a T2 control chart using these data. Use the phase II limits.
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