Question: A design engineer wants to construct SPC chart for controlling the service life of a halogen headlamp his company produces. On three recent production batches,

A design engineer wants to construct SPC chart for controlling the service life of a halogen headlamp his company produces. On three recent production batches, he tested service life on random samples of four headlamps, with these results:
Base on the data, on what sample(s)(if any) does service life appear to be out of control?

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