If you know the historical mean or the historical standard deviation of your process, or if you have an estimate obtained from past data, enter the value to use in the analysis.
- Historical mean
- Enter a value for the mean of the population distribution.
- Historical standard deviation
- Enter a value for the standard deviation of the population distribution.
If you do not enter historical parameters, Minitab estimates the mean and standard deviation from your sample data and uses those estimates to calculate process capability.
If you want to specify the method that Minitab uses to estimate the standard deviation from your sample data, click Estimate.