Z
zecarlin
Hi all!
I have one doubt how to compare 3 groups of data from the same source. I'll explain below:
* I collected the rework time from 15 batches on week 1;
* I collected the rework time from another 15 batches on week 2;
* I collected the rework time from another 15 batches on week 3.
The time decreased during the collection from week 1 to week 3.
When I made a Probability plot on Minitab 16, in 2 cases I had non-normal distribution, so, I can't use the mean of 3 cases to compare.
What can I do? How can I compare this 3 groups? I wanna prove the time reduction!
Best regards.
I have one doubt how to compare 3 groups of data from the same source. I'll explain below:
* I collected the rework time from 15 batches on week 1;
* I collected the rework time from another 15 batches on week 2;
* I collected the rework time from another 15 batches on week 3.
The time decreased during the collection from week 1 to week 3.
When I made a Probability plot on Minitab 16, in 2 cases I had non-normal distribution, so, I can't use the mean of 3 cases to compare.
What can I do? How can I compare this 3 groups? I wanna prove the time reduction!
Best regards.