(Original post by popnit)
Guys, mann whitney is simple really. It's not come up so I advise you look this up and learn how to do it.
There are some basic steps to mann whitney.
First you put data in to 2 columns e.g if you're looking at rainfall in two months and you take 6 readings in each month then do two columns for January and June (just for example). Then put in data from readings under each column. Rank each column lowest first BUT remember to rank both columns together. This means, don't do separate ranks for Jan and one for June. Combine them. If the data is as follows:
Then you know that 60 is the lowest so that gets rank 1, then 70 gets rank 2, then 80 gets rank 3, then 100 gets rank 4, then you use 150 for rank 5 even though it's under Jan. So you go on like this...
Then once you've ranked them, you need to add up your ranks for each column..once this is done use the Mann whitney formula to input the figures. n1 and n2 are the sample sizes so basically 6 for Jan and 6 for Jun.
Hope this helps and please feel free to pass this on.