An adhesives manufacturer periodically selects a sample of its product and glues 6 toothpicks together, in pairs. A measurement is then made of the number of pounds required to separate the toothpicks. The following data represent 15 samples, each consisting of 3 pairs of toothpicks, and the number of pounds required to separate each pair. Given these measurements, use one or more appropriate 3-sigma control charts in evaluating whether the process is in control.

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Pounds to Separate Pair Sample Number 27 27 28 24 27 27 30 25 29 31 25 27 27 25 29 28 25 27 29 28 32 26 10 12 13 14 15 32 28 29 34 24 28 26 27 26 30 24