Question: Continue with the data set in Table 18.5.4, representing the lengths of broccoli trees after cutting. a. Find the center line for the R chart.

Continue with the data set in Table 18.5.4, representing the lengths of broccoli trees after cutting.
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?

TABLE 18.5.4 Lengths of Trees of Broccoli 20 Samples of Four Stems Each Individual Measurements within Each Sample Sample Identification Number 8.60 8.43 8.65 8.39 8.49 8.63 8.47 8.52 8.35 8.31 8.58 8.28 8.45 8.38 8.56 8.39 8.53 8.78 8.48 8.46 8.47 8.42 8.32 854 8.53 8.46 8.63 8.50 8.43 8.65 8.43 8.57 8.52 8.48 8.60 8.47 8.58 8.52 8.49 8.47 8.44 8.62 8.65 8.50 8.61 8.64 8.54 8.31 8.51 8.46 8.55 8.58 8.52 8.41 8.58 8.59 8.54 8.46 8.74 8.70 8.51 8.46 8.51 8.41 8.46 8.54 8.55 8.63 8.61 8.40 8.45 8.48 8.54 8.57 8.51 8.41 8.42 8.50 8.59 8.32 7 9 10 12 13 15 16 18 19 20

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