Question: 18.9 Sample 1 2 3 4 5 6 7 8 x1 18.5 17.9 19.6 22.2 19.1 22.8 19.0 20.7 x2 21.2 19.0 19.8 21.5 20.6

18.9 Sample 1 2 3 4 5 6 7 8 x1 18.5 17.9 19.6

18.9 Sample 1 2 3 4 5 6 7 8 x1 18.5 17.9 19.6 22.2 19.1 22.8 19.0 20.7 x2 21.2 19.0 19.8 21.5 20.6 22.2 20.5 21.0 x3 19.4 20.3 20.4 20.8 20.8 23.2 20.3 20.5 x4 16.5 21.2 20.5 20.3 21.6 23.0 19.2 19.1 a) What is the best control charts should be used for the given data? b) Calculate the control charts parameters. Show your calculations. c) construct the control charts and make your recommendation about the charts

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