Given that in Town A, x number of people were tested for their level of red blood cells and y people had the recommended level,
while in Town B in a similar test z people where tested and w people had levels close to the ones that were recommended in Town A (while in Town A the population used something that supposedly increased their level of red blood cells)
What test would I have to use to compare Town A and B's level of red blood cells?
And what is meant by the question to "state and verify any check required on the data before conducting the test?"
And finally, how do I compute the p-value for the test?

Thanks for your time