Question

NEED HELP! I DON'T UNDERSTAND:

Which is a key assumption of using the process capability metrics of Cp and Cpk?

A) The underlying data is uniformly distributed

B) The lower specification exceeds the upper specification

C) The centering of the data is precise but not accurate

D) The underlying data is normally distributed

E) Excessive variation has already been observed

Answer 1

Correct options:

D) The underlying data is normally distributed

Explanation:

The process distribution is Normal Distribution. This condition of normality of the process distribution is to be satisfied in order to get reliable process capability metrics of c_p and c_pk. Also the process must be in statistical cotrol.