Compute the Cpk index for the process for which the lower and upper specification limits are 4 and 16, respectively; the nominal size is 10.0; and the standard deviation of all three processes, σ, is 1.5. The Cp indexes for process is equal to 1.33.

Skill/Topic: Statistical Process Control
A) 1.333
B) 4
C) 2.333
D) 16
Explanation: Cpk =Minimum [ USL – μ, μ- LSL]/ 3σ = Minimum [ 16-10,10-4]/3*1.5 = 1.333

 

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