Question: 2. The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation equal to 0.146 minutes.

2. The time needed for performing a machining operation is to

2. The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation equal to 0.146 minutes. The means (in minutes) of 39 samples of n=6 are: The average of the 39 sample means is equal to 3.85 . Construct an x-chart for this process with two-sigma limits. Is the process in control

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