The waiting time data in Exercise 6.66 may not be normally distributed. Transform these data using a natural log transformation. Plot the transformed data on a normal probability plot and discuss your findings. Set up individual and moving range control charts using the transformed data. Plot the natural log of the waiting time data on these control charts. Compare your results with those from Exercise 6.66.
Answer to relevant QuestionsThirty observations on concentration (in g/l) of the active ingredient in a liquid cleaner produced in a continuous chemical process are shown in Table 6E.26. (a) A normal probability plot of the concentration data is shown ...The purity of a chemical product is measured on each batch. Purity determination for 20 successive batches are shown in Table 6E.30. (a) Is purity normally distributed? (b) Is the process in statistical process control? (c) ...The diameter of the casting in Figure 6.25 is also an important quality characteristic. A coordinate measuring machine is used to measure the diameter of each casting at five different locations. Data for 20 casting are ...A control chart indicates that the current process fraction nonconforming is 0.02. If 50 items are inspected each day, what is the probability of detecting a shift in the fraction nonconforming to 0.04 on the first day after ...A control chart is used to control the fraction nonconforming for a plastic part manufactured in an injection molding process. Ten subgroups yield the data in Table 7E.9. (a) Set up a control chart for the number ...
Post your question