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 R chart to determine if the dispersion is stable or not.

SampleObsObs2Obs3 Obs4 Obs5 125.99 118.14 125.81312122.41 115.47 115.56 114.80120.80123.13 139.48 117.53 130.8120.49108.22 125.50 141.03 121.64108.45109.18

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