Design of Experiments

"To use statistical methods to make decisions, we need access to data. Consider the following examples about decision making. 1. A government agency wants to find the average income of households in the United States. 2. A company wants to find the percentage of defective items produced on a machine. 3. A researcher wants to know if there is an association between eating unhealthy food and cholesterol level. 4. A pharmaceutical company has developed a new medicine for a disease and it wants to check if this medicine cures the disease. "