Thanks for your reply and let me share with you some of my data information
1- my sample size is 30 samples
2- all my data i have got is within the specification limit 14.9 +/- 1
3- I put my data in the control chart I-MR chart to check if there is any special causes or not and the result is that there is no any special causes
I am new in six sigma and i need your help,
i have a data of a process when i test its capability i found the cpk = 1.01 but when i test its normality i found the P-value = 0.04
is this reasonable? and is there a relation between the CPK and the normality of the process?
And how do i have good CPK while the process is not normal?