The data in Table $7$E$\mathrm{.}19$ 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?