Here is an artificial situation that illustrates an unusual controlchart pattern

Chapter 0, Problem 27.18

(choose chapter or problem)

Here is an artificial situation that illustrates an unusual controlchart pattern. Invoices are processed and paid by two clerks, one very experiencedand the other newly hired. The experienced clerk processes invoices quickly.The new hire must often refer to a handbook and is much slower. Both are quiteconsistent, so that their times vary little from invoice to invoice. It happens thateach sample of invoices comes from one of the clerks, so that some samples arefrom one and some from the other clerk. Sketch the x chart pattern thatwill result.