The diameter of a mason jar is 3 inches but can be as large as 3.03 inches and as small as 2.97 inches. Twenty five samples of mason jars are taken and it is discovered that these components have a grand mean of 3.01 inches and a standard deviation of 0.02 inches. What is the capability of this process?
A) 0.08
B) 0.16
C) 0.33
D) 0.49
E) 0.66

Question

Quizplus · Accepted Answer

The process capability index (Cp) is calculated as (USL - LSL) / (6 * standard deviation). Here, USL = 3.03, LSL = 2.97, and standard deviation = 0.02. Cp = (3.03 - 2.97) / (6 * 0.02) = 0.33.

The Diameter of a Mason Jar Is 3 Inches but Can