Question: Four samples (k = 4) are taken from a process, with each sample consisting of five observations (n = 5). The sampled items are subjected

Four samples (k = 4) are taken from a process, with each sample consisting of five observations (n = 5). The sampled items are subjected to a stress test, and the amount of pressure, measured in pounds per square inch, required to crack each item was computed. The results are as follows:

Develop an x Ì… chart to determine if the process is stableor not.

Sample Obs1 Obs2 Obs3 Obs4 Obs5 125.99 18.14 25.82 131.21 122.41 11547 115.56 114.80 120.80 123.13 139.48 117.53 130.86 120.49 108.22 125.50 141.03 121.64 108.45 109.18

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