Statistics have become an important part of everyday life. We are confronted by it in newspapers and magazines, on television and in general conversations. We encounter it when we discuss the cost of living, unemployment, medical breakthroughs, weather predictions, sports, politics and the state lottery. Although we are not always aware of it, each of us is an informal statistician. We are constantly gathering, organizing and analyzing information and using this data to make judgments and decisions that will affect our actions.