Question

Meena Chavan? Corp.'s computer chip production process yields DRAM chips with an average life of

2,000 hours and sigma? ?= 120 hours. The tolerance upper and lower specification limits are 2,600 hours and 1,700

?hours, respectively. Based on the given? information, the process capability? ratio Cp=

Based on the process capability ratio for the given? information, one can say that the process is __________ of producing the chips to the design Specifications.

Answer 1

Solution:

The process capability ratio (Cp) is calculated as;

Cp = (USL - LSL) / 6

where;

USL = Upper specification limit

LSL = Lower specification limit

= Standard deviation

Putting the given values in the above formula, we get;

Cp = (2600 - 1700) / (6 x 120)

Cp = 1.25

Based on the process capability ratio for the given? information, one can say that the process is very much capable of producing the chips to the design specifications as the desired value of Cp for a capable process is greater than or equal to 1.0