. The data shown here come from a pro-

duction 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 covari-

ance matrix were computed from 50 preliminary samples:

3=[30] = 130 120 200 1307 Construct a Tª control chart using these data, Use the phase II limits.

Transcribed Image Text:

Sample Number 2 1 58 32 2 60 33 3 50 27 4 54 31 5 63 38 6 53 30 7 42 20 8 55 31 9 46 25 10 50 29 11 49 27 12 57 30 13 58 33 14 75 45 15 55 27