Check your assumptions

https://www.youtube.com/watch?v=F1dkr6BggMc

 

Why non-parametric statistics?

https://www.youtube.com/watch?v=xA0QcbNxENs

 

Non-parametric statistics

https://www.youtube.com/watch?v=MKUY_ZC18s4

 

Parametric vs non-parametric statistics

https://www.youtube.com/watch?v=3bcYLj11uME

 

Spearman’s rank correlation coefficient

https://www.youtube.com/watch?v=0qLKfMm45-4

 

Understanding the Mann-Whitney U

https://www.youtube.com/watch?v=YiwJYXfcKjA

 

How to perform a Wilcoxon Signed Rank Test (by hand)

https://www.youtube.com/watch?v=TqCg2tb4wJ0