Validating sampling plans
It is for these reasons that it is imperative teams learn how to employ histograms to graphically display central tendency and variability and to conduct and interpret normality checks.
The references shown in the table below can be used to help teams choose the appropriate graphical method to display their historical or before-data.
A third potential purpose of a process improvement is to stabilize it.
Besides being a project goal, all projects must both check for reductions in variability and prove stability after process improvements have been made to ensure sustainability.
If the data does not exist, this is a potential project killer or could at least extend project cycle time significantly because the team will have to define, collect and validate its own data.
One payoff of the DMP is that the team identifies its comparative experiment plan.