The process capability index $($Cpk$)$ may mislead if:

$($I$)$ the process is not stable.

$($II$)$ the process output is not normally distributed.

$($III$)$ the process is not centered.

Question $19$ Select one:

a$.$

II and III

b$.$

I and III

c$.$

I and II

d$.$

II only

e$.$

I, II$,$ and III