We use statistics as a tool to analyse the data we have With the use of statistics, we can convert a set of data we have at our hand to a more meaningful or more understandable form to facilitate our decisions When we analyse data of different groups, we will find that there are differences in the results between selected groups Media frequently tries to manipulate these data in order to mislead the public But, statistical difference does not always mean that there is a discrimination For an example, is we analyse the gender in prions, % of males are significantly higher compared to the females But this does not mean that prison system is discriminating against males