A Producer of Specialty Products Uses a Variety of Natural

question 22

Essay

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 foot polished slabs are checked periodically for imperfections. For each slab inspected the number of imperfections (pits, rough spots, etc.) is recorded.
a. What type of control chart should be used for these data?
b. If the average number of imperfections per 8 by 4 foot polished slab is 2.6, calculate the centreline and control limits for the appropriate control chart.

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Definitions:

Compounded Semi-Annually

A method of calculating interest where the interest is added to the principal amount twice a year.

Outstanding Balance

The amount of money owed on a loan or credit account that has not yet been paid.

Amortized

The process of paying off a debt through regular payments, where each payment covers both interest and a portion of the principal amount.

Compounded Annually

Interest on an investment is calculated once a year, with the interest added to the principal.