Question: Process time at a workstation is monitored using sample mean and range control charts. Six samples of n-12 observations have been obtained and the sample

Process time at a workstation is monitored using sample mean and range control charts. Six samples of n-12 observations have been obtained and the sample means and ranges computed (in minutes); Sample 1 2 3 Mean 3.12 3.21 3.12 3.95 3.05 3.13 Range 50 141 .44 54 .52 .55 6. Using the factors in Table 10-3. determine the upper and lower limits for sample mean and range control charts. (Round the intermediate calculations to 2 decimal places. Round the final mean answers to 2 decimal places. Round the final range answers to 3 decimal places.) UICE 3.35 LCL 2.87 Mean Range b. Is the process in control? Yes O No

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