Question: Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 10 observations have been obtained and

Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 10 observations have been obtained and the sample means and ranges computed (in minutes):

Sample Mean Range
1 3.06 0.42
2 3.15 0.50
3 3.11 0.41
4 3.13 0.46
5 3.06 0.46
6 3.09 0.45

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
Range

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