1. Standard deviation Spearman's Rank Correlation Chi squared test
Have you taken measurements?
Yes No
Have you counted the number of individuals in two or more categories?
Do you want to know if there is an association between different measurements from the same sample? No
Yes
Yes
Do you want to look at the spread of data about the mean?
Spearman's Rank Correlation
Chi squared test
Yes No
Do you want to compare the mean of two sets of data?
Standard deviation
Yes
Are the data sets paired so that two measurements are collected from the same individual?
Yes No
Paired t-test
Unpaired t-test