The data shown in Table 11.E1 come from a production process with two observable quality characteristics: x1 and x2. The data are sample means of each quality characteristic, based on samples of size n -= 25. Assume that mean values of the quality characteristics and the covariance matrix were computed from 50 preliminary samples:

Construct a T2 control chart using these data. Use the phase II limits.

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= 155 30| $4200 130 120 TABLE 11E.1 Data for Exercise 11.1 Sample Number 58 31 38 31 46 50 49 57 10 29 75