From the course: Six Sigma: Black Belt
Join today to access over 22,600 courses taught by industry experts or purchase this course individually.
Nonparametric tests - Minitab Tutorial
From the course: Six Sigma: Black Belt
Nonparametric tests
- What happens if you want to test theories on differences in means using T tests and a Nova. But the data is not normal. Well, those tests can not be used. So what can you do? Fortunately, there's an alternative. You can compare medians instead of means. Using nonparametric methods. They can also be used if you want to compare medians because you're dealing with duration data like processing times. Let's go over some of the options for nonparametric methods. First, there's the one sample Wilcoxon test. Which can be used to compare the population median to a target. There's also the Mann-Whitney test. Which can be used to compare two population medians of two groups. And there's the Kruskal-Wallis test. It can be used to compare population medians of multiple groups. Let's apply these nonparametric methods using mini tab. To get started download from the exercise files MediansData.mtw and open the file. Here we have three groups A, B and C. With continuous data. Let's assume you want…
Practice while you learn with exercise files
Download the files the instructor uses to teach the course. Follow along and learn by watching, listening and practicing.
Download courses and learn on the go
Watch courses on your mobile device without an internet connection. Download courses using your iOS or Android LinkedIn Learning app.