Kaminsky et al. (1992) present data on the number of orders per truck at a distribution center. Some of these data are sown in Table 7E.24.
(a) Set up a c chart for the number of orders per truck. Is the process in control?
(b) Set up a t chart for the number of orders per truck, assuming a geometric distribution with a = 1. Is the process in control?
(c) Discuss the findings from parts (a) and (b). Is the Poisson distribution a good model for these data? Is there evidence of this in the data?