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Plot an x-bar and r control chart for the process

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The data represents the copper concentration in a plating process. Copper concentration in a plating pool is controlled by an automated colorimeter that takes readings and adjusts the concentration as required. To verify the correct functioning of a new colorimeter system, copper concentration is measured manually six times per shift.

Question (a) Plot an x-bar and R control chart for this process. Perform runs tests to Western Electric. Is the process in control? Revise the control limits as necessary.

Question (b) Estimate the mean and standard deviation of the revised process.

Question (c) Is the layer thickness of the revised process normally distributed?

Question (d) If the specifications are 9.0, 2.0 ppm, estimate the process capability.

Reference no: EM132689239

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