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?

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TABLE 7E.24 Number of Orders per Truck for Exercise 7.82 No of No. of No. of No. of Truck Orders Truck Orders Truck Orders Truck Orders 5 17 2 58 10 26 18 35 26 1 1 22 6 7 1 219 6 27 9 4 39 1226 20 23 28 21 713 10 2 10 29 6 33 143 217 30 12 5 23 8 23 16 424 10 32 S 5 7 8 15 7 31 4