Often, we can't sample a whole population. We look, instead, for the smallest reasonable sample. How do we arrive at that magic number?    The secret behind what is "reasonable" lies in the variability of samples.    Would you expect to get the exact same results if five

different samples of the same sample size were taken?    Let's find out by looking at the percentage of irregulars in your HDF. Hit GO, and the computer will choose five samples of the same size as your safari sample …