Question: The waiting time for treatment in a minute clinic located in

The waiting time for treatment in a “minute-clinic” located in a drugstore is monitored using control charts for individuals and the moving range. Table 6E.24 contains 30 successive measurements on waiting time.
(a) Set up individual and moving range control charts using this data.
(b) Plot these observations on the charts constructed in part (a). Interpret the results. Does the process seem to be in statistical control?
(c) Plot the waiting time data on a normal probability plot. Is it reasonable to assume normality for these data? Wouldn’t a variable like waiting time often tend to have a distribution with a long tail (skewed) to the right? Why?

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