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

A quality inspector took five samples, each with four observations (n = 4), of the length of time for glue to dry. The analyst computed the mean of each sample and then computed the grand mean. All values are in minutes. Use this information to obtain three-sigma (i.e., z = 3) control limits for means of future times. It is known from previous experience that the stan- dard deviation of the process is .02 minute. SAMPLE 1 2 3 4 5 1 12.11 12.15 12.09 12.12 12.09 Observation 2 12.10 12.12 12.09 12.10 12.14 3 12.11 12.10 12.11 12.08 12.13 4 1208 12.11 12.15 12.10 12.12 X 12.10 12.12 12.11 12.10 12.12

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