We have talked about a nifty tool where we can compare two continuous factors and find out if there is any relationship between them.
Now what about we are faced with two sets of data from two categories, such as male and female? This is when we can use the next tool.
b. Box plots: Here are a sample of Box Plots - comparison of MRI count (an indicator of brain size) between male and female
Finally, as in almost anything in life, getting many flying hours is the key to getting a good grip of problem analysis. So, the only advice I have is, do it, practice, repeat.