I have 3 samples of water contamination (bacteria/L) from a lake which I want to compare to another, more "pristine" lake. So I have 6 values in total, 3 belonging to each lake:
contamination, lake type 7576.48, pristine 7472.81, pristine 7511.55, pristine 6803.65, test lake 6692.63, test lake 7128.27, test lake
What is the best test to compare them? In the boxplot they look different. Initially I thought about a Student-t test, but with N = 3 it looks like it will be rather poor, right? Should I go then directly for the Wilcoxon rank sum test instead? Or what do you do when you have just 3 cases for each group?