The specifications for the diameter of a molded part are 10 mm ± 0.5 mm.The actual average and standard deviation from 250 parts sampled is 10.1 mm and 0.1 mm,respectively.What is the process capability as measured by C_p? A)0.84 B)1.67 C)0.60 D)1.00 E)1.01

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Quizplus · Accepted Answer

The process capability index (Cp) is calculated using the formula: Cp = (USL - LSL) / (6σ), where USL is the upper specification limit, LSL is the lower specification limit, and σ is the standard deviation. Here, USL = 10.5 mm, LSL = 9.5 mm, and σ = 0.1 mm. Thus, Cp = (10.5 - 9.5) / (6*0.1) = 1 / 0.6 = 1.67.

The Specifications for the Diameter of a Molded Part Are