10 samples of size 9 were taken from a process, and their weights measured. The sample...

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10 samples of size 9 were taken from a process, and their weights measured. The sample means and sample ranges are in the following table. Population (process) standard deviation is 0.75. a. Calculate the control limits for 3-sigma, and construct/plot x-bar chart and R-chart using these data. b. Determine if the process is in control or not. Explain your conclusion. For sample size 9: Sample Мean Range D4 = 1.816 1 20.01 0.45 D3 = 0.184 19.98 0.67 3 20.25 0.30 19.90 0.30 20.35 0.36 19.23 0.49 7 20.01 0.53 8 19.98 0.40 9 20.56 0.95 10 19.97 0.79 10 samples of size 9 were taken from a process, and their weights measured. The sample means and sample ranges are in the following table. Population (process) standard deviation is 0.75. a. Calculate the control limits for 3-sigma, and construct/plot x-bar chart and R-chart using these data. b. Determine if the process is in control or not. Explain your conclusion. For sample size 9: Sample Мean Range D4 = 1.816 1 20.01 0.45 D3 = 0.184 19.98 0.67 3 20.25 0.30 19.90 0.30 20.35 0.36 19.23 0.49 7 20.01 0.53 8 19.98 0.40 9 20.56 0.95 10 19.97 0.79

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