A quality inspector took five samples, each with four observations (n = 4), of the length oftime for glue to dry. The analyst computed the mean of each sample and then computed thegrand 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 standard deviation of the process is .02 minute.SAMPLE1 2 3 4 51 12.11 12.15 12.09 12.12 12.09Observation 2 12.10 12.12 12.09 12.10 12.143 12.11 12.10 12.11 12.08 12.134 12.08 12.11 12.15 12.10 12.12¯X 12.10 12.12 12.11 12.10 12.12

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A: THE ANSWER IS AS BELOW:

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A: THE ANSWER IS AS BELOW:

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Q: A process that is assumed to be in control with limits of 88 ± 4 had sample averages for the x-bar…

A: THE ANSWER IS AS BELOW:

Statistical Process Control

The use of statistical methods to observe and manage a process to make sure that it operates at its full potential and thus produce a confirming product is called Statistical Process Control.