I have a data set which looks at the effect of diet on 3 different vitamin concentrations (eg. vitamin d, c, iron). There are two measurements for each vitamin - one at the start of the study and one after one month. These measurements are also categorised into male and female samples (10 of each).
Basically, I have to analyse the difference between the male and female vitamin concentrations as well as the differences found between the first measurement and last measurement (separately for males and females), and I'm having trouble figuring out which tests would be best.
Any help much appreciated.