Using a specified random sample from a population, this macro calculates a prediction bound or interval for either a single future observation from the population (if the future sample size is 1) or for the mean and standard deviation of a future sample from the population (if the future sample size is > 1).
Be sure that Minitab knows where to find your downloaded macro. Choose . Under Macro location browse to the location where you save macro files.
If you use an older web browser, when you click the Download button, the file may open in Quicktime, which shares the .mac file extension with Minitab macros. To save the macro, right-click the Download button and choose Save target as.
Suppose your data are in C1. To run the macro, choose and type:
%PREDINT C1
Click Run.
Reference
Hahn and Meeker (1991), pp 61-64.