Question

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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. Paint-M

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

Answer 1

Answers from the given data by using minitat Stat control Charts va axrable control Chart x bar chart Ž = UCL = LCL - 1:0093 loo 799 0.9386 b) Tab the control Chart is By using mini given below c) from the control charts it is that all points are in within Te all points are below UCL above LCL Thus process i s in control seen limit and

Xbar Chart of C1 1.075 UCL=1.0799 1.050 1.025 Sample Mean X=1.0093 1.000 0.975 0.950 LCL=0.9386 7 9 11 Sample 13 15 17 19 arre.. orkanect wurkshee: I CamScanner d ig med