Question: A quality inspector took five samples, each with four observations (n = 4), of the length of time for glue to dry. All values are

A quality inspector took five samples, each with

A quality inspector took five samples, each with four observations (n = 4), of the length of time for glue to dry. All values are in minutes. Use this information to obtain three-sigma (i.e., z = 3) control limits. Construct three sigma mean and range charts. Determine if corrective action is needed. 1 2 3 4 Observation 1 12.11 12.10 12.11 12.08 SAMPLE 3 12.09 12.09 12.11 12.15 2 12.15 12.12 12.10 12.11 12.12 12.10 12.08 12.10 5 12.09 12.14 12.13 12.12

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