You have just used the capability index (Cpk) formulas to compute the two values "min [2, 2.5]." Which of the following is the proper interpretation of these numbers?
A) The true capability index value is 2.5
B) The mean of the production process has shifted to the left of the design limits
C) The mean of the production process has shifted to the right of the design limits
D) The mean has not shifted at all
E) The true capability index value is between 2 and 2.5