For the following check sheet, assume that o indicates a surface scratch, x a blowhole, D a defective finish, * improper shape, and ? others.

	Worker	Mon	Mon	Tue	Tue	Wed	Wed	Thur	Thur	Fri	Fri
		AM	PM	AM	PM	AM	PM	AM	PM	AM	PM
Mach 1	1	oox*	ox	oxx	oooxxxo	oooooxxxo	ooxx	oooo	oxx	oo	oDxx
Mach 2	2	oxx*	oooxx*	oooooxx	oooxx	ooooooxx*	ooooox*	ooooxx	ooox**	ooxx*	ooooo

a. Using Pareto analysis, enter the frequencies for the various defects. (Leave no cells blank - be certain to enter "0" wherever required. Round your percent answer to the nearest whole number.)

Surface Scratch
Blowhole
Improper Shape
Defective Finish
Other

b.By focusing on surface scratches and blowholes, we have ? of the defects or about ? percent of the problems.

c. Would data stratification be useful here (i.e., breaking down defect types by machine and by day)?

• Yes

• No