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):

a. Using the factors in Table 10-2, determine the upper and lowrer limits for sample mean and range control charts.
b. Is the process in control?
Table 10-2

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Sample Mea Range 3.06 23.15 3.3.11 4. ..3.13 5....3.06 63.09 42 .50 41 .46 .46 45 np utsTransfommation Outputs Acceptance Statistical Acceptance sampling sampling process control