Q3.

a. The upper and lower specification limits for a component are 3.8 and 4.2 inches, respectively.

The process standard deviation is 0.05, and the process average is 3.9 inches.

Is this process capable of achieving three-sigma performance? Must show your working. (10 points)

b. For a process, the tolerance range is 8 Std. deviations. Calculate k i.e., the sigma level. (4 points)

c. Given 4 sigma level, a nominal specification of 0.16, and a std. deviation of 0.02, what should be the USL and LSL? (4 points)