# 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.

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?

## Answer to relevant Questions

Why is random sampling a good method to use for selecting items for study? What is the difference between discrete and continuous quantitative variables? Find the center line and control limits for each of the following situations. a.* Percentage chart, sample size n = 300, = 0:0731. b. Percentage chart, sample size n = 450, = 0:1683. c.* Percentage chart, sample size n = ...What problems, if any, are visible in the control charts in Figure 18.5.6? What action (if any) would you suggest? FIGURE 18.5.6 Consider the data set shown in Table 18.5.3, representing the thicknesses of a protective coating. a. Find the average, X, and the range, R, for each sample. b.* Find the overall average, X, and the average range, R. c.* ...Post your question

0