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.

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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