With this product, students use data to plot 3 separate graphs. A graph of mass vs. volume for a mineral sample reveals a direct relationship between the variables, i.e. both variables increase. A graph of Temperature of a cup of coffee vs. time shows an indirect relationship, i.e., one variable increases while the other variable decreases. A third graph shows a cyclic relationship, number of sunspots vs. time. The worksheet is a very good exercise in plotting data points and determining the re