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Continue with the data set in Table 18 5 3 representing the

Continue with the data set in Table 18.5.3, representing the thicknesses of a protective coating.

a.* Find the center line for the R chart.

b.* Find the control limits for the R chart.

c. Draw the R chart.

d. Comment on what you see in the R chart. In particular, is the variability of this process in control? How do you know?

a.* Find the center line for the R chart.

b.* Find the control limits for the R chart.

c. Draw the R chart.

d. Comment on what you see in the R chart. In particular, is the variability of this process in control? How do you know?

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