Question: The time needed for performing machining operation is to be investigated historically, the process has had a standard deviation equal to 0.15 minutes. The means

The time needed for performing machining operation is to be investigated historically, the process has had a standard deviation equal to 0.15 minutes. The means (in minutes) of 12 samples of n=6 are according to the table below: Construct an -chart for this process with three-sigma limits. Is the process in control? The time needed for performing machining

sample 1 2 3 4 5 6 7 8 9 10 11 12 mean 3.81 3.86 3.98 3.96 3.88 3.55 3.83 3.77 3.86 3.8 3.84 3.79

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