A producer of specialty products uses a variety of natural and man-made materials to make unique countertops for kitchens and baths. One product line mixes concrete and natural river stone to make countertops that are polished to a high shine revealing unique patterns. Occasionally coarse sand will result in undesirable pitting and rough spots on surfaces. Consequently, as part of its quality control efforts, 8 by 4 metre polished slabs are checked periodically for imperfections. For each slab inspected the number of imperfections (pits, rough spots, etc.) is recorded. What type of control chart should be used for these data?
A) Run chart
B) p chart
C) c chart
D) x-bar and R charts
E) ARL chart

Question

Quizplus · Accepted Answer

The correct choice is a c chart because it is used for counting the number of defects (imperfections in this case) per unit of output, where the output is a continuous product (like the slabs of countertops) rather than discrete items.

A Producer of Specialty Products Uses a Variety of Natural