In painting an automobile at the factory, the thickness of the color coat has a

Question

In painting an automobile at the factory, the thickness of the color coat has a process mean of 1.00mm and a process std. dev of 0.07mm. 20 samples of 5 cars were tested, resulting in the mean paint thickness shown the data set. Construct the upper and lower control limits for the x-bar chart, using the given process parameters. Plot the data on the control chart. Is this process in control? Explain

Paint Thickness: Means of 20 Samples (n= 5)

Mils 0.996 0.960 1.016 1.017 1.001 0.988 1.006 1.073 1.032 1.021 0.984 1.019 0.997 1.024 1.033 1.030 0.994 0.980 0.977 1.037

Explanation / Answer

In painting an automobile at the factory, the thickness of the color coat has a

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