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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

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 it is show in the Excel file.

The sample means for each quality characteristic for 15 additional samples of size n=10 are shown in table. Is the process in statistical control?

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