Production of computer hard drive disks is in large volumes. For instance, one design and manufacturer produces about 4 million hard drives per quarter. Especially sensitive to the production rate is the automatic die casting and machining of the A383-aluminum alloy for the base of the disk drive. Higher production rates cause many problems, including blow holes, misplaced flashing, unstable dimensions, and warping. The following array is the scrap percent for the automatic die casting and machining line of the hard drive base.

Production, x-(103 units per period)	1000	2000	3000	3500	4000	4500	5000
Scrap, y (% of production rate)	5.2	6.5	6.8	8.1	10.2	10.3	13.0

(a) Determine an exponential and a second degree polynomial equation.

(b) Which model gives the smallest error sum of squares? Which model is preferred for estimating future scrap losses?

Answer rating: 100% (QA)

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