Question: The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation equal to .146 minute. The

The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation equal to .146 minute. The means (in minutes) of 39 samples of n = 6 are:

The time needed for performing a machining operation is to be investigated.

Construct an x-chart for this process with Two Sigma limits. Is the process in control?

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