Select distribution fit > Editor > Edit Distribution Fit > Options
Use to change the distribution and the historical parameter estimates used to fit your data on a probability plot, empirical cdf, or histogram. To add a distribution fit to a histogram, choose Editor > Add > Distribution Fit.
Distribution: Choose a distribution.
Historical parameters: Enter the parameters for the chosen distribution. Minitab displays the necessary parameters, which depend on the chosen distribution. These parameters may include Mean, Standard Deviation, Location, Shape, Scale, or Threshold. If you do not enter historical estimates, Minitab estimates the parameters from the data. You can enter some historical estimates and have Minitab estimate the other parameters. See Distribution parameters for restrictions.
Show confidence interval: Check to display the confidence interval for the fitted distribution (probability plot only).
Confidence level: Type a number between 0 and 100 to specify the confidence level. The default is 95%.