A production manager at Ultra Clean Dishwashing Company is monitoring the quality of the company’s production process. There has been concern relative to the quality of the operation in accurately filling the 16 ounces of dishwashing liquid. Th e product is designed for a fill level of 16.00, ± 0.30. The company collected the following sample data on the production process: Observations Sample 1 2 3 4 1 16.40 16.11 15.90 15.78 2 15.97 16.10 16.20 15.81 3 15.91 16.00 16.04 15.92 4 16.20 16.21 15.93 15.92 5 15.87 16.21 16.34 16.43 6 15.43 15.49 15.55 15.92 7 15.43 16.21 15.99 16.00 8 15.50 15.92 16.12 16.02 9 16.13 16.21 16.05 16.01 10 15.68 16.43 16.20 15.97    a) Is the process mean in statistical control?

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Statistical Process Control

The use of statistical methods to observe and manage a process to make sure that it operates at its full potential and thus produce a confirming product is called Statistical Process Control.