In painting an automobile at the factory, the thickness of the color coat has a process mean of 1.00 mil and a process standard deviation of 0.07 mil. Twenty samples of five cars were tested, resulting in the mean paint thicknesses shown below.
(a) Construct upper and lower - control limits for the x chart, using the given process parameters.
(b) Plot the data on the control chart.
(c) Is this process in control? Explain your reasoning.

Transcribed Image Text:

0.996 0.950 1016 017 1.001 0.988 006 073 032 1021 0.984 1019 0.997 1024 1.033 1030 0.994 0.980 0977 1.037