The following X bar and S charts shown normal control (n=4)
X bar chart S chart
UCL=710 UCL=18.8
Center Line=700 Center Line=7.979
LCL=690 LCL=0
a) Establish process parameters µ and ?.
b) If the specifications are 705+/- 15, estimate the fraction non conforming
c) Calculate all the capability ratios.