$\frac{\frac{03}{18}\frac{?}{?}}{50},$ Attribute Control Charts: $u$ Charts

This case is the second of three related cases found in Chapters $9,10,$ and $13.$ These cases seek to link information from the three chapters in order to resolve quality issues. Although they are related, it is not necessary to complete the case in this chapter in order to understand or complete the cases in the other chapters.

Create a ch

C$10\mathrm{.}2\mathrm{.}3.$

process cap

Max's B$-$B$-$Q Inc. manufactures top$-$of$-$the$-$line barbeque tools. The tools include forks, spatulas, knives, spoons, and shish$-$kebab skewers. Max's fabricates both the metal parts of the tools and the resin handles. These are then riveted together to create the tools $($Figure C$10\mathrm{.}2\mathrm{.}1).$ Recently, Max's hired a process engineer. His first assignment is to study routine tool wear on the company's stamping machine. In particular, he will be studying tool wear patterns for the tools used to create knife blades $($Figure C$10\mathrm{.}2\mathrm{.}2).$

Each quarter, Max's makes more than $10,000,000$ tools. Of these, approximately $240,000$ are inspected for a variety of problems, including handle rivets, fork tines, handle cracks, dents, pits, butts, scratches, handle color, blade grinds, crooked blades, and others. Any tool that has a defect is either returned to the line to be reworked or it is scrapped. Figure C$10\mathrm{.}2\mathrm{.}2$ provides information for their first quarter inspection results.

Subgrou

$0$

$0$

$0$

$10$

$09$:$42$:$00$

$\frac{03}{18}\frac{?}{?}$

$50$

$\backslash$table$[[2],[0],[1],[0],[0],[1],[0],[15],[12$:$00$