Task: Suppose that a process with a normally distributed output has a mean of 55.0 and a variance of 4.0.
Q1. If the specifications are 55.0 +/- 4.00, compute Cp, Cpk,Cpm.
Q2. Suppose the mean shifts to 53.0 but the variance remains unchanged. Recompute and interpret these process capability indexes.
Q3. If the variance can be reduced to 40 percent of its original value, how do the process capability indices change (using the original mean of 55.0) ?