The data in Table 7E.19 are the number of information errors found in customer records in a marketing company database. Five records were sampled each day. (a) Set up a c chart for the total number of...


The data in Table 7E.19 are the number of information errors found in customer records in a marketing company database. Five records were sampled each day.


(a) Set up a c chart for the total number of errors. Is the process in control?


(b) Set up a t chart for the total number of errors, 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 the customer error data? Is there evidence of this in the data?





























































































































































































































TABLE 7 E .19



Customer Error Data for Exercise 7.67



Day



Record 1



Record 2



Record 3



Record 4



Record 5



1



8



7



1



11



17



2



11



1



11



2



9



3



1



1



8



2



5



4



3



2



5



1



4



5



3



2



13



6



5



6



6



3



3



3



1



7



8



8



2



1



5



8



4



10



2



6



4



9



1



6



1



3



2



10



15



1



3



2



8



11



1



7



13



5



1



12



6



7



9



3



1



13



7



6



3



3



1



14



2



9



3



8



7



15



6



14



7



1



8



16



2



9



4



2



1



17



11



1



1



3



2



18



5



5



19



1



3



19



6



15



5



6



6



20



2



7



9



2



8



21



7



5



6



14



10



22



4



3



8



1



2



23



4



1



4



20



5



24



15



2



7



10



17



25



2



15



3



11



2




May 21, 2022
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