Hi Chris,
From my understanding, Nonparametric tests are used for non-normal data- so I assume you first checked for normality and randomness- I won’t go into that process here.
Type of nonparametric testing (and subsequent graphs) depends on your data, comparing:
*1 sample vs. target – use Wilcoxon test
*2 population medians- use the Mann-Whitney test
*population meadians for multiple groups- use teh Krausak-Wallace test
for Minitab use Stats>Nonparametric> XXXXXX test later…graph>probability plot
Hope this helps,
Joe Johnson
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