This document discusses various measures of simple correlation. It begins by explaining how to create a scatter plot using Excel to graph the relationship between independent and dependent variables. It then provides an example dataset measuring temperature and water consumption over seven summer days. It proceeds to define the Pearson Product Moment Correlation Coefficient formula to measure the strength of linear relationships. It also mentions the Spearman Rank-Order Correlation Coefficient and notes there are other measures of relationship. Finally, it cautions that correlation only indicates a relationship exists and does not prove causation.