Question: Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 15 observations have been obtained and

Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 15 observations have been obtained and the sample means and ranges computed (in minutes): Sample Mean Range 1 3.30 0.49 2 3.16 0.41 3 3.21 0.47 4 3.30 0.49 5 3.27 0.46 6 3.20 0.54 a. 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.) UCL LCL Mean 3.35 3.13 Range b. Is the process in control? multiple choice Yes No

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