The upper and lower specifications for a service are 10 min.and 8 min.,respectively.The process standard deviation is 0.25 min.and the process average is 9 min.What conclusion can be drawn?
A) The process is not capable because the process average is out of control.
B) The process is not capable because the process variability is too great.
C) The process is capable.
D) The specifications should be changed to 9.75 and 8.25, respectively.

Question

Quizplus · Accepted Answer

The capability index can be calculated using the formula Cp = (Upper Specification Limit - Lower Specification Limit) / (6 * Standard Deviation). In this case, the Cp value is (10 - 8) / (6 * 0.25) = 4. This value indicates that the process is highly capable, as a Cp value of 1 or above is considered acceptable. Therefore, option C is the correct choice.

The Upper and Lower Specifications for a Service Are 10