A lab process has an average turnaround time of 25.8 minutes and a standard deviation of 1.24 minutes. The nominal (target) value for the process is 25 minutes with an upper specification limit of 30 minutes and a lower specification limit of 20 minutes. The lab director wants to have four-sigma performance for the lab.

Use 2 decimal accuracy for the final answer.

a) For the lab process, the process capability ratio is _____?

b) For the lab process, the process capability index= _____?

c) Based on the value of the process capability index, the lab process meets the four-sigma standard? (circle one)

True

False

Cannot tell whether it is true or false: more information is needed