Question: 5. Inspectors want to develop process control charts to measure the weight of crates of wood. Data (in pounds) from three samples are: Sample Crate

5. Inspectors want to develop process control

5. Inspectors want to develop process control charts to measure the weight of crates of wood. Data (in pounds) from three samples are: Sample Crate 1 Crate 2 Crate 3 Crate 4 1 18 38 22 26 2 26 30 28 20 3 26 26 26 26 (a) What is the upper 3-sigma control limit for the R-chart? (b) What is the lower 3-sigma control limit for the R-chart? (c) What is the upper 3-sigma control limit for the x-bar chart? (d) What is the lower 3-sigma control limit for the x-bar chart? (e) Is the process in a state of control? If not, why not

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