Introduction to Probability Theory and Heath StatisticsModule 4 discussion Professor:September 15, 2014 In inferential statistics, the null hypothesis shows that there is either no relationship between variables or that there is no difference in the experimental and control groups. On the other hand, the alternative hypothesis predicts that the variables are related or that there is a difference in the groups. In a study carried out by Brook and Zhang (2013), the authors focused on how maladaptive personal attributes influences development and progression of lung cancer among women.