Essay
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 control limit for the R chart?
(b)What is the lower control limit for the R chart?
(c)What is the upper control limit for the x-bar chart?
(d)What is the lower control limit for the x-bar chart?
(e)Is the process in a state of control? If not, why not?
Correct Answer:
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(a)20.56, R-bar = ∑R/N = (8 + 12 + 6 + 6...View Answer
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