Studies on a Machine That Molds Plastic Water Pipe Indicate

Multiple Choice

Studies on a machine that molds plastic water pipe indicate that when it is injecting 25 mm diameter pipe,the process standard deviation is 0.50 mm.The 25 mm pipe has a specification of 25 mm plus or minus 1.0 mm.What is the process capability index (Cp) ?

A) 0.50
B) 0.67
C) 1.00
D) 2.00
E) None of the choices are correct.