A nail has been designed to have a length of 4 inches. The standard deviation of the

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A nail has been designed to have a length of 4 inches. The standard deviation of the process is 0.12 inch.

Nails 4.50 4.25 - 4.00 3.75 8 10 2 4 12 Observation number Length (in inches)


A control chart is shown. Each chart has horizontal lines drawn at the mean μ, at μ ± 2σ, and at m ± 3σ. Determine whether the process shown is in control or out of control. Explain.

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